I ordered some headers today & thought might as well
change the exhaust too. Should i stay with 2 1/2 or
go 3in ? And what mufflers to go with it?
thanks,scott

 

You didn't mention which engine/chassis combination you have but I'm assuming either the 4.8L or 5.3L. If you're going with duals, I'd go with 2.5 or smaller. Going with a single-in/single-out high-flow muffler and a single 3" exit will probably give you the best performance and MPG, but duals will provide the sound and 'cool' factor.

 

I went 2 1/2 duals off the cats into dual in dual out 2 1/2 Magnaflow with 18''x3'' tips they sound great no interior drone at all.

 

dont you have Fi?

 

Sorry bout that,Ive got a 2000 5.3 rcsb duals with no cats,delta force muffs,
radix ,e-fans,4.10s,and countless other stuff

 

boosted & modified will support 3"...the smaller will give better low-end to mid power tho with little difference on the top