y pipe yes or no
On The Tree
Joined: Mar 2015
Posts: 105
Likes: 5
From: Cincinnati, Ohio
The more you modify your car, the more you will need a better flowing exhaust. The stock exhaust will really start to choke your motor with just simple bolt ons. This is just a hunch but are you an engineering student? I am, and this is what I have to deal with classmates when I talk cars with them. You can theorize all you want but real world results are real world results. Don't overthink simple solutions.
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
From what I recall, the typical six speed fbody with lid SLP MAF, catback, free mod's typically made 315 to 330 whp with stock manifolds and intake. The 98-00 cars 315-325 whp and the 01 - 02's 325-330 whp. The better cast iron manifolds and LS6 intake helped.
Same mod's on essentially identical cars with headers and tune would dyno 340 who to 350 whp. This way in the old LS1 Edit era before HP Tuners - so feel free to add 5 whp for HP Tuners
The cars with headers could spank the ones without headers most of the time all else equal. So the headers were definitely worth the cost if you like to WIN
TECH Fanatic
Joined: May 2016
Posts: 1,292
Likes: 436
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.
Headers wont give you enough back pressure and your car wont run right. wink wink.
You can get a true dual setup, headers and all, for $700 shipped from speed engineering. If you wanna stick with a single exhaust you can get their headers and y-pipe for $350 plus shipping. This aint rocket science homeskillet. Stop with all of your equations. Headers and exhaust are probably the best bang for the buck you can get for these cars.
You can get a true dual setup, headers and all, for $700 shipped from speed engineering. If you wanna stick with a single exhaust you can get their headers and y-pipe for $350 plus shipping. This aint rocket science homeskillet. Stop with all of your equations. Headers and exhaust are probably the best bang for the buck you can get for these cars.
TECH Fanatic
Joined: May 2016
Posts: 1,292
Likes: 436
From: St. Louis
I'm stock ride height and I still have to be careful. I wonder how well dual cutouts added to my current 3" y-pipe would work with the rest of my setup. I imagine a large volume of the exhaust gas would continue to flow into the merge but would it be as good as an x-pipe?
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This is the end all be all for street cars that use shorty torque arms that want to run Y pipes and have the flexiblity. Now if it was an all out race car, I wouldn't spend the time and money on this system but I wanted it to be quiet, not smell, have good ground clearance, and be able to free up power as needed.
https://ls1tech.com/forums/generatio...e-cutouts.html
It's a SD tune and is optimized for what it is. Car was tuned to be correct AFR at ambient temp and humidity. The cat is designed to clean up the last little bit of unburned hydrocarbons.