[Patriot Motorsports USA]

Originally Posted by AZIROC

That was pretty much my setup (SLP shorties into a 3" exhaust). But that was also #Backintheday when true duals wasn't a thing. Even installing LT headers were dreaded...mostly cause the exhaust was going to be a hack job and hang WAY low.

Well... I installed my ARH 2" primaries yesterday!! LET THE DRONE WARS BEGIN!!

I also found out why I keep getting codes set by #5 cylinder misfire... and you can see the stock manifolds are simply ridiculous!!

[ZLRob]

Chokemaster* fixed it for you.

[Z OH 6]

Originally Posted by ZLElvira

Well... I installed my ARH 2" primaries yesterday!! LET THE DRONE WARS BEGIN!!

I also found out why I keep getting codes set by #5 cylinder misfire... and you can see the stock manifolds are simply ridiculous!!

Stock manifolds on these cars are pretty restrictive, although there was a guy here making around 900whp through the stock manifolds on his CTS-V.

[Patriot Motorsports USA]

Well here ya go... my exhaust is DONE!! Bought this system from a seller here on Camaro6 and it has only taken me six months to get around to installing it!!

Making it #NotSoLoud cause I'm OldSchool!

[18.2SS.1LE]

Originally Posted by ZLRob

Chokemaster* fixed it for you.

Not as bad as you think...

[Z OH 6]

Originally Posted by 18.2SS.1LE

Not as bad as you think...

Source of data? Which mufflers were tested? Flowmaster does make some straight through race mufflers, but its never been a question that their chambered mufflers are more restrictive.

[Gunkk]

That's an Engine Masters chart.

[KingLT1]

Originally Posted by Z OH 6

Stock manifolds on these cars are pretty restrictive, although there was a guy here making around 900whp through the stock manifolds on his CTS-V.

Yeah they are worth 20-25whp, but it's the cat pipes that are the biggest restriction. Either way the bone stock exhaust has supported going 9's @ 140 mph in the 1/4 on these cars. Road course seems to kill the factory cats faster than 1/4mi.

[Z OH 6]

Originally Posted by KingLT1

Yeah they are worth 20-25whp, but it's the cat pipes that are the biggest restriction. Either way the bone stock exhaust has supported going 9's @ 140 mph in the 1/4 on these cars. Road course seems to kill the factory cats faster than 1/4mi.

Yea, the manifold collector is pretty darn small too. I think its 2 1/2" if I recall. Its wild because I've seen Hellcat's making over 1000whp on stock manifolds, they just aren't nearly as restrictive.

[18.2SS.1LE]

Originally Posted by Z OH 6

Source of data? Which mufflers were tested? Flowmaster does make some straight through race mufflers, but its never been a question that their chambered mufflers are more restrictive.

Here's the episode, this was a chambered Flowmaster.

[Z OH 6]

Originally Posted by 18.2SS.1LE

Here's the episode, this was a chambered Flowmaster.

Fair enough. Much better than I would have expected for a chambered muffler. Down on power some but not really noticeable compared to the others unless you're on a dyno.

[18.2SS.1LE]

Originally Posted by Z OH 6

Fair enough. Much better than I would have expected for a chambered muffler. Down on power some but not really noticeable compared to the others unless you're on a dyno.

I've always been under the same impression you were until I saw this dyno test. At over 1,000 hp, you wouldn't even be able to tell on a timeslip with how close the numbers are.