OEM Sport Muffler

[RED_DET]

PM sent.

[marosari00]

I just had my oem sport exhaust come in and installed. I love it. Not tinny but a nice deep growl to it. It sounds fantastic. It sounds awesome at startup and just idling. My wife doesn't seem bothered by it either so thats a good thing.

Just installed one yesterday, on my M56S. It is quite a departure from the stock exhaust. I like the robust note. So far, no interior cabin resonance...I love it. It is now coupled with the HPS intake hoses. Quite a "feel good" combination and highly appropriate for the vehicle.

[JBHorne]

I have the Stillen air intake a longer cat-back exhaust system. I had a custom X-pipe made and actually removed it within the first month. Completely ruined low-rpm performance. You didn't notice the same? Even had the shop drive it both ways and it was significant. I didn't go through the expense of a dyno.

[JBHorne]

How are you doing cat deletes and still passing emissions? Does it depend on the state?

[armybrat]

How are you doing cat deletes and still passing emissions? Does it depend on the state?

The cat deletes that folks talk about refer to the cats that are part of the front Y-pipe assembly. These do not have anything to do with emissions. The main cats that are part of the emissions control are integrated into the exhaust manifolds as one unit. These are not deleted.

[JBHorne]

How are you doing cat deletes and still passing emissions? Does it depend on the state?

The cat deletes that folks talk about refer to the cats that are part of the front Y-pipe assembly. These do not have anything to do with emissions. The main cats that are part of the emissions control are integrated into the exhaust manifolds as one unit. These are not deleted.

Would "test pipes" then be a true cat delete?

[PostalsQ]

Test pipes from what I have read are cat delete

[armybrat]

Test pipes from what I have read are cat delete

Yes true test pipes would be cat delete (exhaust manifolds in the M56). Technically you wouldn't use that term to denote the secondary cat replacement. To my knowledge, there are no "test" pipes that replace the exhaust manifolds themselves, plus you couldn't pass emissions anyway in most if not all states. Some folks who run custom exhausts start from the exhaust manifolds, deleting everything back. Some folks start from the secondary cats and delete just the Y-pipe and resonators. Deleting the secondary set of cats will not affect emissions or throw any kind of CEL, but it will make your exhaust note louder. Just depends on what you want to accomplish.

[JBHorne]

Test pipes from what I have read are cat delete

Yes true test pipes would be cat delete (exhaust manifolds in the M56). Technically you wouldn't use that term to denote the secondary cat replacement. To my knowledge, there are no "test" pipes that replace the exhaust manifolds themselves, plus you couldn't pass emissions anyway in most if not all states. Some folks who run custom exhausts start from the exhaust manifolds, deleting everything back. Some folks start from the secondary cats and delete just the Y-pipe and resonators. Deleting the secondary set of cats will not affect emissions or throw any kind of CEL, but it will make your exhaust note louder. Just depends on what you want to accomplish.

I replaced the Y-pipe with a custom 2.5" pipe and it KILLED my low end torque. I put the factory Y pipe back. I still run the Stillen intakes and longer cat-back exhaust. I also received test pipes as well, but did not install them as I still want to pass emissions. If I wanted to put the Y-pipe back on, do I have to get a re-tune to not lose low end torque? It was a significant loss. Thanks for the help!

[armybrat]

I replaced the Y-pipe with a custom 2.5" pipe and it KILLED my low end torque. I put the factory Y pipe back. I still run the Stillen intakes and longer cat-back exhaust. I also received test pipes as well, but did not install them as I still want to pass emissions. If I wanted to put the Y-pipe back on, do I have to get a re-tune to not lose low end torque? It was a significant loss. Thanks for the help!

In my opinion, a 2-1/2" X-pipe is right for the V8 but too large for the V6. No wonder you lost low end performance. The MAF sensor is probably detecting a lean condition and the ECU is pulling timing to compensate. Yes you can put the factory Y-pipe back and the ECU will compensate. I would suggest a custom tune to take advantage of the increased airflow with the Stillen. You definitely need a custom tune if you add HFC's and/or custom Y-pipe/X-pipe.

[biggie]

Just ordered mine from https://www.tunerzstore.com/ yesterday (bday present for myself).

Hope to have the mufflers on pretty soon.

[RED_DET]

Just ordered mine from https://www.tunerzstore.com/ yesterday (bday present for myself).

Hope to have the mufflers on pretty soon.

Pics or ban....

[biggie]

Just ordered mine from https://www.tunerzstore.com/ yesterday (bday present for myself).

Hope to have the mufflers on pretty soon.

Pics or ban....

I will, hopefully with stock vs sport video/pics.

I haven't even opened the box yet. I hope to put them on this Sunday.

[RED_DET]

I would probably open it to check for any damage... I don't trust UPS or any shipping company for that matter.

[biggie]

I would probably open it to check for any damage... I don't trust UPS or any shipping company for that matter.

Yeah I'll get it open this week sometime. Box looks in good shape though.

[biggie]

Got it installed. No vids yet. Driver's side is just a bit closer to the bumper and that makes me nervous. Old bolts on stock pipes were insanely hard to get off, had to go with impact gun.


Old stock ones:




New sport mufflers:

[RED_DET]

Need some heat to bend that hanger on the driver side.

[biggie]

Need some heat to bend that hanger on the driver side.

Yeah, I need to find the time to do that.

[armybrat]

Got it installed. No vids yet. Driver's side is just a bit closer to the bumper and that makes me nervous. Old bolts on stock pipes were insanely hard to get off, had to go with impact gun.

Its amazing how much lighter the sport mufflers are...the factory ones weight a ton LOL.

As far as clearance, you can try and loosen the flange bolts. There may be enough play to make an adjustment. Also, the tips themselves are adjustable, but more front to back and the slant angle instead of up and down. My mufflers ended up being slightly canted upwards to the inside, so I had to roll the tips the opposite way a little so that the slants would line back up.

Anyway, they look great!

[DocJim]

Biggie - any Video of Sport Mufflers yet? How do they sound?

[moneyteamlouis]

And this would work on an M37X as well?

[RED_DET]

And this would work on an M37X as well?

Correct. We have them listed on our website.

[Larz]

I'm wondering if the sport mufflers might also fit the older M35s. I currently have the Tanabe medalions and they're great. BTW on the website, it says 2006-2007 but they fit my 2009 with no modification needed - they were a simple swap so maybe they should say: 2006-2010?

[RED_DET]

They probably could say 2006-2010, although Tanabe's website shows 05-07....

[1080Rider]

A little off topic... is our exhaust 2 inch or 2.25? It is weird to me that all the exhaust kits are interchangeable between the V6 and V8. There is a big difference in hp and torque between the two motors and where one could excel w/ a big exhaust, the other would lose two much low end torque to make a big kit worthwhile... I have a exhaust shop nearby that does tons of custom work for hotrods and stuff. I'll probably have them do up a kit for me that goes up one size (2 to 2.25) and includes high flowing mufflers, unless the stock exhaust is 2.25 then I'll probably just go w/ higher flow mufflers.

[armybrat]

A little off topic... is our exhaust 2 inch or 2.25? It is weird to me that all the exhaust kits are interchangeable between the V6 and V8. There is a big difference in hp and torque between the two motors and where one could excel w/ a big exhaust, the other would lose two much low end torque to make a big kit worthwhile... I have a exhaust shop nearby that does tons of custom work for hotrods and stuff. I'll probably have them do up a kit for me that goes up one size (2 to 2.25) and includes high flowing mufflers, unless the stock exhaust is 2.25 then I'll probably just go w/ higher flow mufflers.

The stock exhaust is 2" Y-pipe and 2" mid pipe/resonators all the way back to 2" stock mufflers. The sport mufflers are also 2" inlet and outlet. FYI the resonators choke down to 1-3/4" ID.

[1080Rider]

The stock exhaust is 2" Y-pipe and 2" mid pipe/resonators all the way back to 2" stock mufflers. The sport mufflers are also 2" inlet and outlet. FYI the resonators choke down to 1-3/4" ID.

Great info! A 2.25 from cat back would really open up the exhaust system!

[armybrat]

The stock exhaust is 2" Y-pipe and 2" mid pipe/resonators all the way back to 2" stock mufflers. The sport mufflers are also 2" inlet and outlet. FYI the resonators choke down to 1-3/4" ID.

Great info! A 2.25 from cat back would really open up the exhaust system!

Yes it would...I went up to 2-1/2" X-pipe on my M56, from the exhaust manifold back.

BTW, the stock exhausts for the V6 and V8 are not exactly the same.

The V6 exhaust manifolds and cats are separate parts. On the V8, the exhaust manifold is also the cat.

The V8 Y-pipe is different from the V6, in that it has a second set of cats welded into it. The V6 Y-pipe does not. I believe the midpipe/resonator unit is the same for both cars, and the mufflers are the same.

[biggie]

Biggie - any Video of Sport Mufflers yet? How do they sound?

Replied to your PM, but no I haven't got a video yet.

I plan on at least removing the secondary cats sometime, need more sound. But it is a large improvement over stock.

[ssmrico]

how does resonator delete sound. got a 11 m37s recently and been thinking about doing so. but was told it might not sound good ?