y pipe yes or no
Thread Starter
Staging Lane
Joined: Oct 2017
Posts: 53
Likes: 1
y pipe yes or no i read on forums about the benefits of after market exhaust, if u had the 345 hp slp kit on your 2002 SS. there does seem to be of any advantage, doing exhaust work. doing the math a 3 inch intermedia pipe will support 2 x 2 inch muffer and tail pipe, the factory 3,1/2 by 1.5 y pipe has the same area as a 2.5 inch pipe, yes fluid dynamics would say there is more drag in the factory y pipe and thus reduce flow, the math to use is this diameter divided by two then square the answer and then times pie 3.14. this does not even talk about exhaust velocity cause by heat and effect on that. to me spending over a thousand for 10 hp is not worth it. the manifolds are so good on LS motors it does not seem to make sense to spend a large chunk of money on headers, i believe tune the engine for headers will return additional 5% horse power increase
TECH Fanatic
Joined: May 2016
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From: St. Louis
Its been proven time and again that longtube headers provide a serious power gains in these cars. All ls1 f-body cars came with the same manifolds and y-pipe regardless of what catback they were optioned with. Unless you are Swapping a 4.8 into one of these cars ( I did, it's my daily beater and I love it) you will see measurable and worthwhile improvements upgrading the exhaust. I have a 3" Y pipe setup with longtubes and a single cutout in the intermediate pipe on my 02' ls1 Z28 and I'm in well into the 11's at 3800lbs with short duration low lift truck cam. I know I'll see gains with a 3" x-pipe setup and I plan to do just that with some worked over 706's and a little more cam in the near future.
Thread Starter
Staging Lane
Joined: Oct 2017
Posts: 53
Likes: 1
But is it worth it? I not saying there no improvement it is just that 5% is it worth spending thousand + $ for?
the y pipe part is based on raw science. ( dia divide by 2 then x itself ( answer ) then times by 3.14 )
i have nothing to gain
the y pipe part is based on raw science. ( dia divide by 2 then x itself ( answer ) then times by 3.14 )
i have nothing to gain
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TECH Fanatic
Joined: May 2016
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From: St. Louis
I guess you won't get bit by the mod bug if you don't mod. I say if you aren't going to do headers, get a cutout ($30), a magnaflow($125 for just the muffler) welded in, or both. This is the most bang for the buck you can get on stock pipes.
TECH Junkie
Joined: Nov 2013
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From: White Bear, Mn
That's what I run. LT headers into 3in. un catted y with flow master 4in. merger into 4in. electric cutout with stock catback
Thread Starter
Staging Lane
Joined: Oct 2017
Posts: 53
Likes: 1
What you do to your LS1 Its been proven time and again that longtube headers provide a serious power gains in these cars. All ls1 f-body cars came with the same manifolds and y-pipe regardless of what catback they were optioned with. Unless you are Swapping a 4.8 into one of these cars ( I did, it's my daily beater and I love it) you will see measurable and worthwhile improvements upgrading the exhaust. I have a 3" Y pipe setup with longtubes and a single cutout in the intermediate pipe on my 02' ls1 Z28 and I'm in well into the 11's at 3800lbs with short duration low lift truck cam. I know I'll see gains with a 3" x-pipe setup and I plan to do just that with some worked over 706's and a little more cam in the near future.
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Joined: May 2016
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From: St. Louis
2002 Z28, full weight, 245/50/16 nittos. Runs 11.80's @ 115mph with 1.6x 60ft times.
Suspension is all stock accept for tubular lower control arms and panhard bar, both sway bars still in place.
I upgraded my exhaust!!! pacesetter 1-3/4 longtubes with 3"y-pipe and a magnaflow welded in with the stock tailpipes.
Whisper lid and free ram air mod is all for induction. Nothing ported.
Btr stage III truck cam and blue LS6 springs.
Tci SSF 3500 10" converter pn# 242932
3.73:1 in the stock ten bolt, probably don't even need those but they help make the converter feel tighter.
That's it, that's all I've done.
It's been tuned with a good wideband of course, that is key. Good luck attacking the forums with your maths.
Suspension is all stock accept for tubular lower control arms and panhard bar, both sway bars still in place.
I upgraded my exhaust!!! pacesetter 1-3/4 longtubes with 3"y-pipe and a magnaflow welded in with the stock tailpipes.
Whisper lid and free ram air mod is all for induction. Nothing ported.
Btr stage III truck cam and blue LS6 springs.
Tci SSF 3500 10" converter pn# 242932
3.73:1 in the stock ten bolt, probably don't even need those but they help make the converter feel tighter.
That's it, that's all I've done.
It's been tuned with a good wideband of course, that is key. Good luck attacking the forums with your maths.
My car gained 25+ rear wheel going from stock car back to true duals. The stock manifolds and exhaust is terrible.
I have a full build thread..
Oh that is with hewiers and an aftermarket y pipe .
Id say stock manifolds/ y / exhaust to headers and duals would be 45-50 horse on a cammed car
I have a full build thread..
Oh that is with hewiers and an aftermarket y pipe .
Id say stock manifolds/ y / exhaust to headers and duals would be 45-50 horse on a cammed car
Originally Posted by stockA4
2002 Z28, full weight, 245/50/16 nittos. Runs 11.80's @ 115mph with 1.6x 60ft times.
Suspension is all stock accept for tubular lower control arms and panhard bar, both sway bars still in place.
I upgraded my exhaust!!! pacesetter 1-3/4 longtubes with 3"y-pipe and a magnaflow welded in with the stock tailpipes.
Whisper lid and free ram air mod is all for induction. Nothing ported.
Btr stage III truck cam and blue LS6 springs.
Tci SSF 3500 10" converter pn# 242932
3.73:1 in the stock ten bolt, probably don't even need those but they help make the converter feel tighter.
That's it, that's all I've done.
It's been tuned with a good wideband of course, that is key. Good luck attacking the forums with your maths.
Suspension is all stock accept for tubular lower control arms and panhard bar, both sway bars still in place.
I upgraded my exhaust!!! pacesetter 1-3/4 longtubes with 3"y-pipe and a magnaflow welded in with the stock tailpipes.
Whisper lid and free ram air mod is all for induction. Nothing ported.
Btr stage III truck cam and blue LS6 springs.
Tci SSF 3500 10" converter pn# 242932
3.73:1 in the stock ten bolt, probably don't even need those but they help make the converter feel tighter.
That's it, that's all I've done.
It's been tuned with a good wideband of course, that is key. Good luck attacking the forums with your maths.
TECH Fanatic
Joined: May 2016
Posts: 1,292
Likes: 436
From: St. Louis
haha, I'm still not sure what Op was hoping to get out of his postings. If he doesn't want to mod his car he shouldn't come around here. After listening to your jargon all this time You've about got me convinced to fly cut and put the biggest cam I can fit in every vehicle I own!
