I'll be doing a S/C build this spring and I'm looking around for some exhuast, I was thinking of just getting a custom cat back made for now before I buy a header and dp, what Diameter can I go up to before I don't have enough back pressure or run into other issues, I was thinking 2.5"


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2.5" is the ideal size exhaust for a blower car.

 

Search button is your friend

 

would my car be fine with 2.5" stock for a little while tho?


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Yes.

 

I ran a full 2.5" exhaust when I was NA

 

I ran a 3" Header and DP with a 2.25"exhaust when I was SC'd..You'll be fine.