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I have been lookign all over the place for a 3inch or 4inch exhaust system for a GS300 and can't find anything i give up! Anyone know of any Manufacturer who makes one? complete catback!!!
nobody makes one. You'll have to get it custom made at an exhaust shop, which likely would be cheaper anyways. Don't bother with a 4inch exhaust by the way unless you're stroked to 3.4L and running like 30psi of boost. I wouldn't even bother with a 3" unless you're over 10psi.
You want a 4" cat back...as in 102mm diameter? You'll have to share with us how you did the DuraMax Turbo Diesel swap! Did you make your own engine mounts? How 'bout the tranny--Allison? Retrofit duallies and shave the rear fenders?