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I have a 88 GTA
I have headers and a y pipe
Highflow cat and the magnafow cat back exhaust
This Set up worked amazing for years 305 you t5
Now I have a 383 t56 and I was just wondering if I need duals or bigger single?
What hp Does the exhaust max out at
What rpm
Ty
I'm running long tube headers with 3 inch collectors, three inch custom exhaust and a magnaflow muffler at the rear on my LS1 at 400HP with no issues. I just ordered a hi flow magnaflow cat (part # 59929) from Summit this morning.
