[DrM]

Ultimate Racing,

I personally would NEVER buy an exhaust for my 335 that sounds like one of the loud "fart can" type mufflers that I hear running around on the Subarus, Evos, or Hondas.

I would be looking for something a little more aggressive than stock at idle, with NO droning noises while driving down the freeway, and a nice sound under hard acceleration. My primary importance would be increased flow over the stock system without being too much louder while driving.

I rode in a friends STI with the large single exhaust. The droning while driving around town would drive me completely nuts.

[Hegemony]

Darryl,

Your OP focuses on turbo-back exhaust designs. I assume this means you plan to implement a high flow cat into your design. Can you please confirm?

As Vishnu is the current (only?) highly talked about tuning mod currently available for the 335, a true dual system with a dual muffler and possibly a limited selection of tips would probably serve the broadest range of customers looking to upgrade the 335. Vishnu Tuning says their system works best with a true dual system that focuses on minimizing back pressure.

Even when other tuning shops develop and production release chip flashes and or piggy back systems, I just can't see their systems being designed for optimal performance with an exhaust system that may introduce or cause variations in back pressure.

But then again, what do I know?

EDIT:
Personally, I'll be looking for the following features in any aftermarket exhaust system I purchase:
-True dual system with both cat back and turbo back options
-Weight different compared to stock
-Improved flow with minimal changes to audible volume levels
-Tip options offering stock style looks, larger outlet looks and possibly //M style looks (aka quad tips for if/when aftermarket bumpers become available)

-Hegemony

[Ultimate Racing]

Originally Posted by BMWPower06

getting the holes enlarged to fit quads is not hard to do, and i think most people would prefer the quad set up.
In terms of sound, i think the general concensus of BMW owners is a sound that is deep and has some rasp to it, and of course the louder the better

For some reason I personally don't think most would be too crazy about cutting their rear bumper to fit a quad tip. I could be wrong though. Any more input from others on this?

Darryl

[Ultimate Racing]

Originally Posted by DrM

Ultimate Racing,

I personally would NEVER buy an exhaust for my 335 that sounds like one of the loud "fart can" type mufflers that I hear running around on the Subarus, Evos, or Hondas.

I would be looking for something a little more aggressive than stock at idle, with NO droning noises while driving down the freeway, and a nice sound under hard acceleration. My primary importance would be increased flow over the stock system without being too much louder while driving.

I rode in a friends STI with the large single exhaust. The droning while driving around town would drive me completely nuts.

Every engine has a unique sound to it. Differences in muffler design (generally, how restrictive, and what packing material) usually determine the sound. Of course, there will be sound clips/videos, and decibel readings made available for everyone to choose.

Darryl

[Ultimate Racing]

Originally Posted by Hegemony

Darryl,

Your OP focuses on turbo-back exhaust designs. I assume this means you plan to implement a high flow cat into your design. Can you please confirm?

As Vishnu is the current (only?) highly talked about tuning mod currently available for the 335, a true dual system with a dual muffler and possibly a limited selection of tips would probably serve the broadest range of customers looking to upgrade the 335. Vishnu Tuning says their system works best with a true dual system that focuses on minimizing back pressure.

Even when other tuning shops develop and production release chip flashes and or piggy back systems, I just can't see their systems being designed for optimal performance with an exhaust system that may introduce or cause variations in back pressure.

But then again, what do I know?

-Hegemony

Plans for turbo-back, as well as cat-back actually. The downpipes we plan to make will have high-flow metal catalytic converters installed. These cats actually flow over 800 CFM, and last a long long time.

Thanks for your input. True dual has always been the original plan, but I just wanted everyone's feedback on alternatives. A single large midpipe exhaust may also seem attractive to some if the price tag is very friendly, and performs well.

Darryl

[jerrygarcia]

sounds like some good plans you have in the works. As far as tips go, i would prefer dual(not quad) and not rolled tips. personally.

[Ultimate Racing]

Originally Posted by jerrygarcia

sounds like some good plans you have in the works. As far as tips go, i would prefer dual(not quad) and not rolled tips. personally.

So you would prefer a single-walled exhaust tip? How many others prefer this?

Darryl

[Hegemony]

Add me to the single wall preference. Good catch jerrygarcia

[T I T A N]

Originally Posted by Ivan01

You guys should also make Dual 3" Turboback w/ Dual Muffler (Dual Tips)
since some people want to go bigger turbos.

I 2nd that, or even maybe oval tips something like on a RS4.

[jayjay]

Originally Posted by bzabodyn

I vote a big fat "NO" to any form of quad tips... should be reserved to M cars only, imo.....

+1

Quad tips on non Ms is rice IMHO. Single tips FTW.

[ctgazer]

where are you located in toronto?

[BMWPower06]

maybe u can do what fab speed motorsports did and have interchangable tips, i know on the 997 TT u can have the stock tip layout, or if you prefer u can swap the tips with a quad tip layout, great idea

[all8up]

Originally Posted by Ultimate Racing

Plans for turbo-back, as well as cat-back actually. The downpipes we plan to make will have high-flow metal catalytic converters installed. These cats actually flow over 800 CFM, and last a long long time.

Thanks for your input. True dual has always been the original plan, but I just wanted everyone's feedback on alternatives. A single large midpipe exhaust may also seem attractive to some if the price tag is very friendly, and performs well.

Darryl

Also to consider, for many of us living in regions that require emissions testing. It will be essential that your system offers a street (high flow cat) and race version (catless)...and obviously the street version would have to be able to pass emissions.

[doctordel]

Originally Posted by DrM

Ultimate Racing,

I personally would NEVER buy an exhaust for my 335 that sounds like one of the loud "fart can" type mufflers that I hear running around on the Subarus, Evos, or Hondas.

I would be looking for something a little more aggressive than stock at idle, with NO droning noises while driving down the freeway, and a nice sound under hard acceleration. My primary importance would be increased flow over the stock system without being too much louder while driving.

I rode in a friends STI with the large single exhaust. The droning while driving around town would drive me completely nuts.

+1

[doctordel]

Originally Posted by Hegemony

Add me to the single wall preference. Good catch jerrygarcia

No rolled tips for me, either.

[BMWPower06]

Originally Posted by all8up

Also to consider, for many of us living in regions that require emissions testing. It will be essential that your system offers a street (high flow cat) and race version (catless)...and obviously the street version would have to be able to pass emissions.

yea agree, going back to the fab speed exhaust i was talking about earlier, taking off the cats literally takes less than 5 minutes under the car, if you could develop a design like that for the 335, well lets just say i think i found the exhaust i want

[Jonn335]

i like the idea of a turbo back system with the maximum possible x section for the first 3 or 4 feet,- where the gas is hottest- From there on a 2 1/2" dual system with removable cats, and the option to have 2 or 4 tailpipes, with the 4 outlet version the same as the new M3.

[bnj]

What is the turbo exit diameter? Small turbo exit diameter can be the bottleneck an if it is, it would compromise maximizing the first 3-4 feet after the turbo. Thus large diameter in the beginning of the exhaust system might not be cost effective if the price tag associated is high.
As Jonn335 said, the gas is not hot at the tips and thus the tips do not need to be any bigger than the the exhaust itself, i.e. 2.5" tip at the end of 2.5" exhaust is just perfect. To avoid weight, there is no need to have any "tip" as such. You can just cut the exhaust after the rear bumper.

[picus]

Originally Posted by Ultimate Racing

For some reason I personally don't think most would be too crazy about cutting their rear bumper to fit a quad tip. I could be wrong though. Any more input from others on this?

Darryl

I think the kind of guys who are buying exhausts on the internet will likely not be opposed to some cutting. I wouldn't.

I had no idea you guys were in Toronto; use my car!

[BMWPower06]

Originally Posted by bnj

What is the turbo exit diameter? Small turbo exit diameter can be the bottleneck an if it is, it would compromise maximizing the first 3-4 feet after the turbo. Thus large diameter in the beginning of the exhaust system might not be cost effective if the price tag associated is high.
As Jonn335 said, the gas is not hot at the tips and thus the tips do not need to be any bigger than the the exhaust itself, i.e. 2.5" tip at the end of 2.5" exhaust is just perfect. To avoid weight, there is no need to have any "tip" as such. You can just cut the exhaust after the rear bumper.

3" tips for sure, 2.5" is too small, unless its a quad with 2.5" tips

[picus]

So here's a question out of curiosity; why do you guys hate rolled tips so much?

[Adham]

i would look for a turbo-back exhaust setup that has:

1- a true dual setup, no joining of the pipes

2- slightly bigger than stock dual tips, not quad

3- sound that is deep and aggressive but has no drone. I can't stand drone.

4- a downpipe that will stand more heat than the stock piece.

Thanks Ultimate Racing for coming on here and listening to us