Lowandslowww

Ive got a true stock ls6 heads intake motor from a 04 ctsv in a iroc, I've got a 4 inch cold air intake 6.0 truck maf, a tick torque max stage 3 cam, bt racing dual springs, 1-3/4 inch long tubes eBay cheaps with 3 inch collectors into a 2.25 inch exhaust shop made y pipe into the old school flowmaster dual mufflers. After a tune the car made 388hp and 386 torque on a dyno jet but the guys tuning it said it should do better but fell off due to an exhaust issue. So I've got a new exhaust system ordered with it being a matching 3 inch y pipe for the long tubes and magnaflows 3 inch cat back system ordered. What kind of gains if any would you guys expect with the new set up?

Full-Force

iTrader: (11)

confused on what exactly your old system is....you says y pipe which would be a single exhaust but you say flowmaster muffler(s) which makes me think duals

without knowing anymore im gonna say an extra 10hp or so

your power numbers are not bad if its an automatic

nine8ss

iTrader: (5)

10-15 hp gain with the larger exhaust. Keep in mind that many of the ebay 1 3/4 headers are actually 1 5/8. You are leaving power on the table running those manifolds.

Lowandslowww

6 speed and it goes from a small y pipe to single 2.75 inch to flowmaster single in to duals the long tubes are stainless steel works. If that helps

Full-Force

iTrader: (11)

Ok, I think you have that shitty 80 series crossflow flowmaster muffler. Might as well cap the exhaust tips off and let it find a leak somewhere in the exhaust. That would probably flow better than that muffler!


Get us some pics

Nick.H

the blowmasters are a real bitch. I say get a straight thru muffler design like the SLP

ICRAZY6

iTrader: (68)

First the cheap long tubes aren't helping you much, more than likely choking you right off the get go. Flowmaster exhaust I really haven't see many rave reviews on them, but going from a 3" collector to 2.25" exhaust is slowing down the exhaust gases a lot.

Just upgrading your exhaust from collectors to muffler will net you about a 12-15hp.

punkysable

I'm running the same cam with mild lobes on my 98 stock heads. I made 390hp and 380tq with a Maf delete. 6 speed car. I got speed long tubes, ls6 intake, y pipe going into flowmasters. I'm also curious to see if you get more power by getting rid of the flowmasters and going with a different exhaust.