So with the top swap and speed daddy headers, would it be better to go with a 2.5" or 3" exhaust sytem?

 

What's the exit size of the downpipe? Just match that through I guess. Though shouldn't be much of a problem running a 2.5" pipe if you wanted.

 

Also if she's supercharged, go 3", otherwise 2.5" should be sufficient

 

So since I'm doing the exhaust after I supercharge, I should get the speed daddy headers that have a 2.5" outlet to the 2.5" downpipe (probably offroad for noise purposed), then the 3" exhaust from there on back. Ill probably keep the resonator so it isn't so raspy, but I want to get some flowmaster 40 mufflers.

 

If possible, go with a 3" downpipe also. I guess that depends if you can ge theaders that will mate up to a 3" or not.

 

if you have headers you don't need a downpipe, that's part of the headers.