3" y-pipe vrs 2.5" gains?
This is a discussion on 3" y-pipe vrs 2.5" gains? within the External Engine forums, part of the LSx Technical Help Section category; At what h.p. would the "stock" 2.5" exhaust pipe be good til? H.p. wise? Also how much gains could one ...
04-20-2011, 12:36 PM #1
3" y-pipe vrs 2.5" gains?
At what h.p. would the "stock" 2.5" exhaust pipe be good til? H.p. wise? Also how much gains could one expect to get from a 3" y-pipe when it "merges" to a 3"? Just doesn't make much sense to me as to have a 3" y-pipe that merges to a 3"?
Wouldn't it make more sense if you were upgrading to a 3" y-pipe to make the merge at least a 4" instead of a slamming all that exhaust into the same size diameter pipe??
04-20-2011, 01:01 PM #2
04-20-2011, 07:55 PM #3
04-21-2011, 07:03 AM #4
i really dont think going to 4 inch is going to gain anything really worth doing the trouble over. 3 inch is the most common. 2.5 inch will restrict you a bit if you decide to go internally later down the road, heads, cam, etc... i say just get a 3 inch ory pipe if you want. If you your worried about the merging into one pipe then go with 3 inch duals with a x pipe that will be plenty of breathing for her. just a litttle bit more expensive
04-21-2011, 08:36 AM #5
04-21-2011, 03:29 PM #6
And yes you are right, it makes more sense to merge a 3" Y into a 4" I-pipe. Going from a 3" Y to a 3" I-pipe does create a bottle neck.
We ran several 3" catbacks on one particular car, keeping the headers and Y the same. Switched to a Mufflex 4" catback and the car picked up nearly 3 tenths and 3-4 mph.
Bottom line, trying to funnel 400 HP through a single 3" exhaust system is actually quite restrictive. You are better off either running a true dual system of some form,,,,or jumping to at least the Mufflex 3 1/2 inch catback.
04-21-2011, 06:04 PM #7
04-21-2011, 07:13 PM #8
It's not so much the muffler choice, it's the size of the piping that we found to make the biggest difference.
05-03-2011, 03:20 PM #9
05-03-2011, 03:23 PM #10
05-03-2011, 03:24 PM #11
- Join Date
- Jul 2009
- North of the Motorcity
Custom Swirly Black
- 2001 WS6 M6
05-03-2011, 03:39 PM #12
Once installed, you couldn't even see it. He used the single hidden tailpipe setup.
On the 3 1/2" I also chose the single hidden tailpipe. I also went with the Magnaflow muffler that is now optional as well.
Not sure off hand how much HP this system in particular will support.
06-09-2011, 05:06 PM #13
just wanted to let you guy's know that i went with a 3" y-pipe to a 4" catback with a mufflex muffler. Sounds awesome!! And yes it was a tight fit, but well worth it. It does fit nice with no ground clearance issues. Not even over the axle.
06-09-2011, 05:07 PM #142001 camaro z28 ss vert with factory slp upgrade, LT headers with a 4" exhaust airlid,s.s.r.a.,t.c.bypass,ported and polished m.a.f torquer v 2. comp cam with ported and polished heads and a tune with EFI Live Tune.
Dyno- 399 r.w.h.p.
384 lbs of torque
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