Anyone interested in 2.25" exhaust system?

[Jeff Williams]

I got my mufflers, resonators, cats, and tips in, finally. I will be taking Lola to the custom exhaust shop for a complete system from the manifolds back. I will get him to make an x-pipe for me.

I first have to punch out the cats, and get a baseline dyno reading.

Anyway, Wes said I should make sure the guy can replicate the system. I was thinking I could have the guy just bend 2 systems at the same time, while he has my car on the rack. I will be getting mandrel bent stainless piping

I have about $300 in Magnaflow products now. I have no idea what the pipes and install will run me.

If anybody wants me to, I will have a duplicate system made for them and they can either clamp it in, or have it welded in at their muffler shop.

I will probably have this done sometime next week or the following week.

Just let me know.

FYI, I bought the following Magnaflow products from Performance Peddler

2 model 10415 resonators1 model 11385 rear dual in / dual out muffler2 model 94005 catalytic converters2 model 35121 Stainless Steel tips

http://www.performancepeddler.com

Dan sent me a wholesaler code:

If you go to our website, performancepeddler.com and use the wholesale login code bestoffer4u, you will get our preferred customer pricing level. Let me know if I can be of any other assistance.

Thanks,

DanCustomer Service Dept.1-800-470-1443http://performancepeddler.com

[Q45tech]

code bestoffer4u.....................where has marketing creativity gone?

[CrimsonQ]

My pipes from cats back and install cost $289

But I didnt have an X pipe made either.

Cant wait to hear it!

[tkd_q45]

Any particular reason for using Magnaflow products over others?

[maxnix]

Darn........should have done the twin turbos by now!

[BlackBirdVQ]

If anybody wants me to, I will have a duplicate system made for them and they can either clamp it in, or have it welded in at their muffler shop.

Jeff,Let me know this is exacly the same setup I wish to run on my Q and my whole exhaust is falling apart. Local place wanted 800 bux to do the same thing you are doing with me brining in my own Magnaflow mufflers/cats. I keep on cutting up aerosol cans and clamping them over new holes that make their way into my exhaust piping ! Its ghetto but it stops leaks from sounding like ****.

Let us know, and be sure to post some pictures along with maybe a sound clip of what it sounds like. I would like to keep my Q sounding quiet but still a lil mean at the same time. Lil bit of exhaust noise wouldn't kill me, I already have a loud azz Maxima....

[squeefoo]

$79.80 Stainless 2.5"

http://www.autoanything.com/ex....aspx

[Jeff Williams]

Yeah, all I could find out there were 2.5" x-pipes. I want to stay close to OEM, for torque. With the HP rating of the engine 2.25" should be fine.

I may end up paying $800 for mine, too (I hope not). I don't know these guys, but I do have a referral from the Dyno shop, and he does all of their systems.

I will ask him how much it would be more, to bend up a second set and throw them in the trunk.

I will try to get a sound clip before and after for you guys.

I may run her down the track tomorrow, to get a baseline 1/4 mile time as-is, then run her again, after the modification. The local Corvette club is having a Show and Go car and bike show tomorrow at Montgomery Motorsports park.

The Dyno shop will do 3 pulls before the mod, for $75, and the next 3 after the mod "We'll give you a good deal". I forgot to ask them what brand the dyno is. It is probably a Mustang. I guess that would be more accurate than the 1/4 mile times.

A fellow Corvette owner and i have been toying with the idea of starting up our own Dyno tuning business. With all the import, Corvette, Mustang, and Dodge guys around, it might be a good business. I don't think there is one on the southside of Birmingham.

[Rex]

Nope <-- Bastage

[squeefoo]

For some reason I had 2.5" on the brain... resulting in the typo.

If you click on the select product icon they are available in 2.25" for $79.80

[AZhitman]

Any particular reason for using Magnaflow products over others?

Pretty simple - They're the best.

[AZhitman]

FYI, for anyone considering this, the X-pipe is CRITICAL on the Q for performance.

Don't even bother doing a system if you're gonna skip this part.

[CrimsonQ]

FYI, for anyone considering this, the X-pipe is CRITICAL on the Q for performance.

Don't even bother doing a system if you're gonna skip this part.

Yeah Yeah I didnt get one!

Was going too, but the Y33 is consuming my cash now

[elwesso]

This summer I think im gonna have a X pipe welded in, and then see if I want to cut the rear mufflers out.

[CrimsonQ]

Bleh, my resonators are gone, it might not be worth the cost

I think my whole system would need redone.

Im so indecisive now, I almost wanna sell my springs and get some for the Y

[elwesso]

But i sitll have an H pipe and I wanna get the X pipe...

if you want to get rid of the springs LMK... I want an extra set for my personal chambers. Maybe see if someone could recreate them cheap...

[CrimsonQ]

If its gonna change my sound, then no lol!

Ill let you know on the springs.


Modified by CrimsonQ at 2:22 PM 4/28/2006

[Q45tech]

I wish someone would measure the back pressure of oem after the cats [bothsides] and graph vs rpm [vs MAF- frosting on cake], so we could get a PRECISE ACCURATE idea concerning what is possible in the way of improvements.

[Jeff Williams]

I was changing my oil tonight, and adding the 2 MM spacers to the wheels and decided since the car was on jack stands, to punch the pre cats. It was a job, since the car was only 2' off the ground.

I fired her up, to blow out all the dust and crap before I hooked back up the main system. MAN! That engine sounds MEAN with no exhaust!

The pre cats looked fine. They were not melted, but you could see some build-up on them. The main cats stayed hot for a long time! They were still warm when I was puting them back on after 2 hours!

Now the car is ready for some 1/4 mile runs tomorrow.

[elwesso]

How much change in sound? or have you not hooked the exhaust back up yet?

Later this year im gonna take vids of my Q with no exhaust

[redmanfx]

Jeff, I would like to duplicate what you're doing Magnaflow and all. Could you shoot me an e-mail?

What about 3" headers running into 2.5" exhaust system? If I did have the headers made should I keep the whole system 3"? I'm not much on back pressure and all so please educate me.

In addition I advised the guy who may do the headers that I may have a group of guys who'd want them as well, so he's mulling it over as to whether or not he wants to do it. Price would be aroung $400 for 3" custom headers for the 90 - 93 G50's and I guess that should work for all the G50's thru 96. Now I've done the sales pitch and I'm just waiting on his answer, so keep your fingers crossed as I believe $400 is a steal!

red

[Q45tech]

When you remove or MOVE back pressure location farther from O2, this changes their accuracy and warm up time and cruise response.

Also the EGT calibration [amount of flow at cruise backpressure drops]

All in all this might result in a chage in highway MPG..........probably no biggy.

It might make the knock sensitivity worse in Summer....on sudden open throttle at low rpms.

I know of a few examples but it doesn't seem to affect drivabilty just different.Get some fresh O2 sensors.

[Jeff Williams]

Wes, there is little difference in sound, maybe a little more raspy, and a little burbling when the motor was decelerating after I revved her up afew times.

The Magnaflow muffler and resonators should allow a little more sound. Since I am going from roughly 2" to 2.25", the tone should be a little deeper, but not liek a Mustang. The Magnaflow rear muffler is an X-flow design straight through. The resonators are definitley 2.25" straight through. With them only being 4" in diameter, there should be less noise cancelling than the OEM Nissan mufflers. The Magnaflow cats are about 75% the size of the OEM.

Red, I don't know much about back pressure, except that less hurts the bottom end torque, but is better for top end power. It is going to mess with my EGR system, since it will take a lot longer to heat up the main cats. Bigger is not always better. The pipes need to be sized for the ammount of exhaust flow will be moving down the pipe. 2.5" should be fine for all the HP a Q can produce in my opinion. I went with 2.25, since I don't intend to supercahrge or turbocharge my Q. around 300 RWHP is all I am looking for. My Corvette makes about 300 RWHP from the factory, and it came with 2.5" exhaust. The guys going to 600 RWHP are going to 3" pipes and long tube headers. I would pay $400 for a set of long tube headers for the Q. Keep me informed.

Dennis, You are right about the warm-up time. I noticed the ECU was struggling with the idle control last night and this morning, until the car got warmed up. I hope the gas mileage doesn't suffer from punching the pre cats. I think it is time for new O2 sensors anyway. Is there any reason I should not just buy BOSCH at the local Advance Auto?

[Q45tech]

except that less hurts the bottom end torque............who say proves this. The back pressure the ENGINE exhaust sees is primarily set by the closest components to the exhaust valve. Function of exhaust temperature and the cool down over distance .................why cat backs do so little.

Bosch USA inexpensive low spec replacement parts with short design life, but if you don't mind the process of changing them every year or 2....why not.

[CrimsonQ]

I never bought another Bosch product since the ill fated platinum +4 plugs were out!

[Jeff Williams]

That is why a lot of enthusiests punch out the pup cats.

I read somewhere that Infiniti used Bosch O2 sensors.

Would the sudden change in back pressure affect the ECU's ability to mix the fule properly at idle?

I am experienceing a "sometimes" rich idle condition, like I used ot on Layla, when the MAF connection was poor. I wonder if this is just coincidental, or related to the O2 sensors and ECU's inability to adapt to the loss of the pup cats.

Any thoughts?

[elwesso]

dont confuse the japanese bosch and the german bosch. Yes its different..

The OEM replacements are NTK, which are made by NGK, i think. At least you can get those from sparkplugs.com for about 1/2 of OEM.

I dont think that the precats being punched woudl make any difference. it didnt make any difference in my Q.

[Jeff Williams]

Thanks, Wes. I jsut ordered 2 O2 sensors. You saved me about $60 over Advance Auto.

I got to select NicoClub.com as my referral too.

They weren't running the timers yesterday at the track, so I didn't bother running Lola.

There was a Nova slipping terribly, and an El Camino that I think I could have beaten, but the rest of the cars would have smoked me by more than 5 car lengths. I think I might have held my own against the Harley riders, though.

The guys that run Dyno Pros had a sick 2002 Z06 with a Magnusun supercharger. They were running about 6 PSI of boost and had an 80 shot of Nitrous. They were running drag slicks, and were blowing everybody away, until a 1980 Malibu pulled him by 5 car lengths off the line. I knew, when the front end of the Malibu came off the ground about 2', that the Vette was in trouble.

It was the Capital City Corvette club's version of "Pinks" The owner of the track also owns the ones in Birmingham & Huntsville. He offered the track to the club for free for any charitible events we want. I think the B'ham club will do one in the fall. I am going to ask him to turn on the timers for us. He is a big "Vette owner and fan.

[franknitty69]

do you guys think its better to go with a magnaflow tru-x crossover pipe with brand x muffler or just use dynomax ultra flo-x muffler (with built in crossover)?

thanks

[Q45tech]

I think the question to ask is an X cross over better than a H type cross over on this particular engine and exhaust system? Maybe 1-2 HP at most it will change the sound profile.