AMS explores the Gen Coupe exhaust. - Genesis Forum: GenCoupe Hyundai Genesis Forums

GenX · 03-24-2009, 04:54 PM

We had a chance to get the Coupe up on the lift today to explore designs for the AMS Gen Coupe exhaust. The factory exhaust leaves a bit to be desired. The exhaust is approximately 2 3/8" OD (60mm) and is even crushed down to 1 3/4" to clear the factory body brace in one spot.

But anyway.... a quick description of the factory exhaust system.

Starting at the turbo, there is a cast O2 housing / catalitic converter / down pipe. This is something that we will work on very soon.The down pipe attaches to the mid pipe which is stainless steel and has a very nice flex section in it.

The mid pipe attaches to a secondary cat. This secondary cat is post O2 sensor so deleting this will not throw a check engine light. The pipe between the secondary cat and muffler is also stainless steel and has a bullet style resonator in it. I suspect that the ID of the resonator is smaller than the rest of the exhaust system. The muffler section appears to be mild steel. It is large and looks heavy.

I got a chance to weigh the exhaust yesterday and here are the weights.

Mid pipe 6.4 lbs

Secondary catalytic converter 6 lbs

Cat back 44.4 (pipe with resonator 11.8 lbs muffler section 32.6 lbs)

Total exhaust system from down pipe back 56.8 lbs

The good news is that there is room for improvement. We did some careful measuring and feel that a 3" system will fit very well and still be routed cleanly. The muffler(s) will need to be positioned in the rear of the vehicle or ground clearance will suffer. The factory system is already slightly below the level of the pinch welds in several places so any muffler positioned forward of the rear differential will be a speed bump scraper for sure (worse on lowered cars).

We are going to explore several possibilities including a side entrance dual end outlet like we are using for our BMW 335i exhaust, a dual muffler straight shot setup, and possibly a tunable exhaust like we are producing for the Evo X.

As with all exhausts we produce, the AMS Gen Coupe exhaust will use 100% stainless steel and mandrel bent tubing. Our exhausts always use stainless steel flanges and not slip joints which are known to leak and blow apart. We also only use 100% stainless steel high flow mufflers so you are ensured years and years of rust free use.

NeverNZ · 03-24-2009, 05:35 PM

3" would be sufficient. any new dyno info with the exhaust off?

merlin2111 · 03-24-2009, 05:45 PM

side exit could be sexy. i just did a horrible chop and i didnt mind it.

GenX · 03-24-2009, 05:47 PM

Quote:

Originally Posted by NeverNZ

3" would be sufficient. any new dyno info with the exhaust off?

Still working on burning the 87 octane out of it. I should get it back on the dyno by this weekend with 93 octane and may play around with exhaust or lack there of.

NeverNZ · 03-24-2009, 05:53 PM

Quote:

Originally Posted by GenX

Still working on burning the 87 octane out of it. I should get it back on the dyno by this weekend with 93 octane and may play around with exhaust or lack there of.

<---- Waiting patiently

ibanez37 · 03-24-2009, 07:44 PM

How much louder do you expect your exhausts to get? I know 3" exhausts can get pretty loud on boosted cars, but I saw an SS/TC with a full 3" magnaflow I think and it sounded barely louder than stock. I'm looking for minimal noise, but something still above stock.

Also, dual tips FTW! You should definitely do dual tip no matter what. I think it fills the gaps perfectly. Don't disappoint us!

GenX · 03-24-2009, 07:58 PM

Quote:

Originally Posted by ibanez37

How much louder do you expect your exhausts to get? I know 3" exhausts can get pretty loud on boosted cars, but I saw an SS/TC with a full 3" magnaflow I think and it sounded barely louder than stock. I'm looking for minimal noise, but something still above stock.

Also, dual tips FTW! You should definitely do dual tip no matter what. I think it fills the gaps perfectly. Don't disappoint us!

Dual tip on each side or total?

cant_stop_spinning · 03-24-2009, 08:02 PM

dual tip on each side for sure seems to be the most popular option. But thanks for the info!! I'm so glad you guys are working on this car

RCSG_Gen · 03-24-2009, 08:09 PM

I vote for dual tips total, 1 on each side. Just looks much cleaner in this application imho. the quad tips look abit overbearing on a 20k car.. just my .02

MP-Omnis · 03-24-2009, 08:24 PM

I appreciate these write-ups, GenX. Great job.

Anybody think trapezoidal tips would look good?

**chris@vtengineering** · 03-24-2009, 09:01 PM

hey ivan, most people want the dual tips per side. and it does look pretty darn good. we're going with that method too

McFly · 03-24-2009, 10:16 PM

More good info. subscribed.

AdR · 03-24-2009, 11:05 PM

Hey GenX a quick question. With the choked section where the frame brace is do you forsee the need to remove/modify/replace that brace or is there enough room to fit the exhaust in there without rubbing issues? Thanks.

econorocket · 03-24-2009, 11:34 PM

Quote:

Originally Posted by AdR

Hey GenX a quick question. With the choked section where the frame brace is do you forsee the need to remove/modify/replace that brace or is there enough room to fit the exhaust in there without rubbing issues? Thanks.

+1

Jabberwocky · 03-25-2009, 04:40 AM

Quote:

Originally Posted by MP-Omnis

I appreciate these write-ups, GenX. Great job.

Anybody think trapezoidal tips would look good?

I saw a photochop of a GC with vertical stacked quads like the IS-F - that looked awesome, but only if the diffuser is shaped accordingly.

quicksilver · 03-25-2009, 06:02 AM

I hope there is an option for a 3" or higher for the 3.8 V6. I plan on going forced induction at some point.

minik2 · 03-25-2009, 06:16 AM

2 tips total...1 on left one on right...none of this 4 tip garbage....my 2 cents

EDIT: Important that it has a deep growl not a whining type motorcycle sound.....its a car with a beefy v6 not a scooter. Tin cans prohibited

merlin2111 · 03-25-2009, 06:34 AM

here is my quick chop of a side exit exhaust. i would like to see a better rendering of a nicer rear bumper with a difusor or something, but you can at least see where i was going with this. i think it looks slick.

minik2 · 03-25-2009, 06:50 AM

Quote:

Originally Posted by merlin2111

here is my quick chop of a side exit exhaust. i would like to see a better rendering of a nicer rear bumper with a difusor or something, but you can at least see where i was going with this. i think it looks slick.

YUCK!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

NeverNZ · 03-25-2009, 07:01 AM

Quote:

Originally Posted by ibanez37

How much louder do you expect your exhausts to get? I know 3" exhausts can get pretty loud on boosted cars, but I saw an SS/TC with a full 3" magnaflow I think and it sounded barely louder than stock. I'm looking for minimal noise, but something still above stock.

Also, dual tips FTW! You should definitely do dual tip no matter what. I think it fills the gaps perfectly. Don't disappoint us!

3" exhaust doesnt need to be loud.

On my supra i had an 85mm(~3.3") GReddy Super Dragger exhaust, and it was quiet compared to most other 3" exhausts. It was straight through, made plenty of power, but sounded great. Only slightly louder than a stock 350Z

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