Q45 Performance Exhaust

[Haitian_King]

Hey guys,

What sort of exhaust would you recommend that has HP gains and a nice sound to it. I don't want that high-pitched VTEC ricer exhaust sound, but a nice deep growl.

[maxnix]

OEM. No significant performance gains from loud vibrating exhaust.

Read Q45tech's posts.

[96Qowner]

Not exactly what you were asking about, but some great reading:

Who makes headers for the early Q?

Dyno Runs With Headers....finally

Headers, O2 sensors, JWT ECU, & air/fuel ratio question

Some of those classic Q45tech posts in there, too.

[96Qowner]

Here are some threads about modifying the Q45 exhaust system without adding headers:

Custom Magnaflow Exhaust modifications

Best sounding exhaust

MY new pipes

Q got its voice!

[Haitian_King]

Gah. Never mind then. I guess I'll just do like Ozzie and take the muffler off and run straight pipes. I don't think I need too much more horsepower anyway.

My friend told me he saw a 93 G50 that was used as a Undercover Narcotics Police Interceptor. He said that while the outside looks stock, the inside is gutted, plastic rear seats, no carpet, just really spartan on the inside.

He said the suspension was re-done, like a heavy duty one, and the windows are smoked glass, not the vinyl type of tint. The engine was rebuilt as well as the transmission. He said he saw a shift kit in there. (No clue what that means)

The dealer was asking 6500 for it.

[Q45tech]

Compared to 4 door Police cars of that era or today units* the 93 Q walked away from them in every category with oem Michelin tires ...................STOCK.

With ecu, loud exhaust some simple sway bars and shocks it was unbeatable especially with radio jamming [simple even when encrypted].

* except Camaro and Chrysler 5.7 hemi which are solved with rear facing 20mm or flascets. Rear camera nice for remote aiming.

Back in mid 1990's common to retrofit for getaway especially in Miami.

After all when you are grossing a few [10-20] mil a month mainteance costs are miniscule. They always cranked under warranty. What more could you ask.

[Haitian_King]

I wish I had the money. I think I'd buy it. And take it to the track. Throw a ECU in there, and maybe a NOS kit, and just rake in the money.

Show up in a complete sleeper, and just FLY!

[Rex]

To address several threads as of late .

I own/have owned 3 Q45's

My original, 1994, 75k - Stock + forged Z33 wheels/tires

Da Beast (rsiwicki), 1995t, 165k - Robert/NICO 8-Way ECU, 4.08 Rearend, 92 transmission, LevelTen with 2,400 Stall, Eibach with the Blues, Stillen Camber Adjustments, Stillen FTSB, Custom Ram-Air JWT PopCharger, Custom Headers, BRM Exhaust, Powerslot Rotors/Axxis MM Pads......

Quella (AZhitman), 1995t, 132k - 4.08 rear, Active sway bar, JWT ECU, low-mileage JDM takeout motor, all new belts, hoses, injectors and knock sensors, 18" 2004 Q45 Premium wheels with newer Michelin Pilot Sport tires, Eibach springs, new Tokico Blue shocks, polyurethane bushings, B&M transmission cooler, custom front strut tower brace, SS brake lines, NGK Platinum (one step colder) plugs, Hawk pads, SP rotors, SilverStars, etc (Note: Engine was swapped earlier this year [before I purchased] for a low-mileage JDM takeout. All rubber replaced and all injectors are new. New TPS and knock sensor as well.)

Da Beast is by far the more fun to drive, exciting and "seat of the pants" faster, even now that it doesn't have an higher stall or Level 10 transmission.

Anyone can say what they want, and yes, I only have a data point of 3 cars, but the headers/exhaust combo is the most noticeable modification, IMHO.

All those things said, if you don't have $7-$10k to spend after getting it to OEM standards, you're really just "bench racing". I didn't ahve that kind of money, but I bought the car from someone who did .

[marksport]

I was reading an article about the Hamann modified Ferrari Scaglietti 612. The only modification on the engine is a full exhaust system. This resulted in 50hp over stock. On Hamann website, they also claim 53hp increase for the 599 GTB Fiorano. The 50/53 hp gain is around 10% over stock. Everyone has said that the stock F50 Q45 exhaust is as good as it gets, so an aftermarket system is pointless. So my question is, how does Hamann manage to get this much power out of the Ferrari? Is it to say that the factory Ferrari exhaust is so flawed and poorly engineered that Hamann engineered a new system that increases power this much? Is Hamann just bull$hiting and thinks that anyone who buys their system will just take their word?

I also noticed that the 2006 M45 Element 114 exhaust has 8hp and 13ft-lb gain on the dyno, while Stillen claims a 15hp and 12ft-lb increase on their exhaust kit.

If a complete exhaust is made for the Q45, and I am talking about a full exhaust including headers, is it possible to see significant increases?
Modified by marksport at 10:33 AM 1/29/2008

[bullittandy]

The above post makes an excellent point. There is always room for H/P on stock cars. The question is instead-can someone find it and can anybody afford it? Aftermarket exhausts for new Porsches gain maybe 5-8 HP on the N/A cars but cost $2000. An aftermarket exhaust on a 03 Mustang Cobra will make 35-40 H/P over stock and cost $1200.

You'll notice the first post's wording- "no performance gains" which is likely very true, you might get 5 H/P but you can't feel 5 H/P.

However, people don't buy exhausts or intakes or etc just for one reason, some like looks, some like sound, some like changing sh*t on their cars for the fun of it-and sometimes it works (witness my Ford explorer transmission cooler mod). To each their own-which is sorely missing on this forum.

[oldmako]

However, people don't buy exhausts or intakes or etc just for one reason, some like looks, some like sound, some like changing sh*t on their cars for the fun of it-and sometimes it works (witness my Ford explorer transmission cooler mod). To each their own-which is sorely missing on this forum.

DING DING DING! WE HAVE A WINNER!!!!!!!!!!!!!!!!

[maxnix]

1.) I also noticed that the 2006 M45 Element 114 exhaust has 8hp and 13ft-lb gain on the dyno, while Stillen claims a 15hp and 12ft-lb increase on their exhaust kit.

2.) If a complete exhaust is made for the Q45, and I am talking about a full exhaust including headers, is it possible to see significant increases?

1.) The point is, without at least a 10% gain, it would not be noticable beyond the added noise on the road. Any gain is not on the low end but at higher rpm at WOT. How much do you drive like that?

2.) Rob's tubular 4 into 1 header did away with the pre-catalists (he didn't have that much money), so most of uw couldn't run them. If you went to the trouble like Nissan did and did and run some bench dynamometer design timefor some 4 into 2 into 1 headers with at least two pre-catalists on both sides, you defintely coiuld improve top end performance. It's all money boys, unless you just want more noise to make your car "different."

Read Q45tech's previous posts. He has done pop-chargers and loud after market exhausts (but not headers, Rob is the only one).
Modified by maxnix at 7:47 AM 1/29/2008

[Q45tech]

It's all about the SCIENTIFIC METHOD, if you understand the thermodynamics of an engine and exhaust, make simple measurements [don't need a worthless dyno] and THINK about the restrictions and what's possible and what you can do about them.

Calaculate how much NEGATIVE HP is used to allow air/fuel to flow in, compress before firing, push used air out Vs the amount of POSITIVE HP the firing cycle creates SUBTRACT the bad from the good and you have flywheel HP.