limits of stock exhaust - Genesis Forum: GenCoupe Hyundai Genesis Forums

XLChaos · 08-18-2012, 08:48 AM

My last car I had I put an after market catback on and I loved the sound. But after 4 years it got pretty old. I have had the genesis for about 2 months now and I am really enjoying the stock sound. Now I know no other performance exhaust is going to be quiet. Which leaves me with my only option. Keeping the stock exhaust. So my question is how much is it going to limit my power. Is it possible to get in the ball park of 300hp with the stock exhaust?

Thanks

itslikeanegg · 08-18-2012, 10:22 AM

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XLChaos · 08-18-2012, 11:02 AM

A lot of the stage kits include some sort of exhaust work. And upgrading the turbo or adding more boost would cause the exhaust to be even more of a limiting factor

itslikeanegg · 08-18-2012, 11:26 AM

At the bare minimum you're going to need hfc's and preferably cat deletes.

XLChaos · 08-18-2012, 12:27 PM

Yah I was thinking that. But I don't want it to be raspy. And usually removing cats cause raspiness ( if that's even a word)

ElDominio · 08-18-2012, 12:57 PM

I plan on keeping my stock axleback, I'll probably convert it to 3"

1qwik6 · 08-18-2012, 01:02 PM

Turbo= no rasp

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Synthmanic · 08-18-2012, 02:44 PM

I currently have the stock axle back with a hfc and secondary cat delete with 3" piping. It sounds a little louder with a very deep note. No rasp at all. Actually have gotten many compliments on how it sounds.

XLChaos · 08-18-2012, 02:52 PM

Quote:

Originally Posted by Synthmanic

I currently have the stock axle back with a hfc and secondary cat delete with 3" piping. It sounds a little louder with a very deep note. No rasp at all. Actually have gotten many compliments on how it sounds.

Could you post a clip of how it sounds?

Kolk1 · 08-18-2012, 03:21 PM

I have a stock muffler with different tips. But besides that Im 3inch and catless. Before it gets to the stock muffler I have a 12inch gradual reducer that goes from 3 down to 2.5. I personally love it. Great tone, still quiet, no drone.

Normal driving, it sounds damn near stock, WOT its still quieter than my turbo and BOV. lol

I have pushed this setup to 320whp and 380wtq. Back when I was doing 27ish lbs of boost. Now im on a haltech and only doing 23lbs(but runs stronger)

flylow · 08-19-2012, 02:49 PM

Quote:

Originally Posted by ElDominio

I plan on keeping my stock axleback, I'll probably convert it to 3"

Quote:

Originally Posted by Synthmanic

I currently have the stock axle back with a hfc and secondary cat delete with 3" piping. It sounds a little louder with a very deep note. No rasp at all. Actually have gotten many compliments on how it sounds.

your whole exhaust will be the size of the smallest diameter.... so a 3'' midpipe with a 2.5'' axle back will still perform like a 2.5''

XLChaos · 08-19-2012, 05:46 PM

What would be the bigger limiting factor. the stock axle back or hfc?

ElDominio · 08-19-2012, 06:48 PM

Quote:

Originally Posted by flylow

your whole exhaust will be the size of the smallest diameter.... so a 3'' midpipe with a 2.5'' axle back will still perform like a 2.5''

I'll probably convert it to 3', if you didn't see.
I plan on enlarging the hole on the stock axleback to 3

itslikeanegg · 08-19-2012, 07:39 PM

Quote:

Originally Posted by flylow

your whole exhaust will be the size of the smallest diameter.... so a 3'' midpipe with a 2.5'' axle back will still perform like a 2.5''

I think it may be possible that because the exhaust gases cool down as they travel through the exhaust path, you actually can get away with a smaller diameter piping downstream while maintaining the same exhaust velocity

**Tim@BeyondRedline** · 08-20-2012, 09:00 AM

Quote:

Originally Posted by XLChaos

What would be the bigger limiting factor. the stock axle back or hfc?

Most definitely the catalytic converters.....10+ whp gains from pulling stock cats. Not so much with the axle-back.....

flylow · 08-21-2012, 09:33 AM

Quote:

Originally Posted by itslikeanegg

I think it may be possible that because the exhaust gases cool down as they travel through the exhaust path, you actually can get away with a smaller diameter piping downstream while maintaining the same exhaust velocity

well my dynos showed otherwise... when i had a slipping clutch after installing a 3'' single exit turbo back plus tune i installed the stock axle back on... my hp and especially tq went down a bit... i completed the deal by also installing a used megan mid pipe i picked up for $70 but left the 3'' turbo-midpipe section and hp & tq went down a lot...

flylow · 08-21-2012, 09:35 AM

Quote:

Originally Posted by XLChaos

What would be the bigger limiting factor. the stock axle back or hfc?

switching the stock axle back will give you more sound improvement than hp. youll prob gain 3-4ish whp at the most. hfc's prob double that, completely eliminating the cats plus a tune = +15

itslikeanegg · 08-21-2012, 09:45 AM

Quote:

Originally Posted by flylow

well my dynos showed otherwise... when i had a slipping clutch after installing a 3'' single exit turbo back plus tune i installed the stock axle back on... my hp and especially tq went down a bit... i completed the deal by also installing a used megan mid pipe i picked up for $70 but left the 3'' turbo-midpipe section and hp & tq went down a lot...

I can't argue with results lol. Was the car equipped with both cats as well?

flylow · 08-21-2012, 10:24 AM

Quote:

Originally Posted by itslikeanegg

I can't argue with results lol. Was the car equipped with both cats as well?

nope, always had the br offroad pipe = two cats gone

mateen446 · 08-21-2012, 10:34 AM

Here's what I have ATP catless 02 and catless downpipe

Genesis 2.0T with Depo racing Catless downpipe - YouTube

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