Which size Cats?
Thread Starter
Drifting
Joined: Aug 2005
Posts: 1,645
Likes: 90
From: Sparks NV
Which size Cats?
I'm moding an LT4 dual exhaust system for my 91' L98. I found a complete system in nice shape. The pipe size is 2.75 in. Question is do I go with 3" I/O high flow cats or 2.5". They don't seem to come in 2.75" sizes. I'm thinking 3" for better flow with a step up from the J pipe off the manifold and a step down to the system. While I'm at it who sells Dynatech cats? Still high flow but cheaper than the RT's.
Thanks
Thanks
Team Owner
Joined: Dec 2000
Posts: 90,675
Likes: 304
From: SE NY
Cruise-In II Veteran
Since the cats will the main restrictors in the system go with 3" in/out.
Beyond the cats 2 1/2" pipes will support up to 500 hp at the crank, assuming the mufflers flow 550cfm each.
Beyond the cats 2 1/2" pipes will support up to 500 hp at the crank, assuming the mufflers flow 550cfm each.
Thread Starter
Drifting
Joined: Aug 2005
Posts: 1,645
Likes: 90
From: Sparks NV
That's what I thought too... It looks like Summit Racing is the place for the Dynotech's.
I noticed some Dynotech copies on E-Bay, honeycomb core and all, anyone try these yet? Cheap at $39 a piece...
I noticed some Dynotech copies on E-Bay, honeycomb core and all, anyone try these yet? Cheap at $39 a piece...
