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What's the best size turbo back exhaust, 3 1/2 or 4"?
I had to replace a muffler some time back. Muffler shop had a 4" in/out Magnaflow that we installed and just welded in the excess gap btw it and the stock pipe. I'd like to just use the same muffler instead of buying the entire exhaust with a new muffler.. Does anyone know where I can get the pre-fab pipe and use my muffler?
Any good MPG mods you can suggest.. 15.5-16 hwy at best... (3.73 gears)
4'' is plenty big and sounds great. The only reason to go with a 5'' is becasue the sound is a little better. You dont need anything over 4'' unless you plan on making some serious power.
I have plenty of power, if there is such a thing.. anyway.. I'm looking for more mpg's w/o loosing the power I have. and if whatever mods help mpg and if horsepower increases, great..