Two different questions,,,Cheap? /ubbthreads/images/graemlins/shrug.gif Best?
First off, WELCOME TO TDS!!
Now, the cheapest would be EBAY probably for a cheap, aluminized exhaust, fit may not be the best,,so install could be difficult. BEST would be one of the MBRPs from any of the sponsors on here. I hear the FIT and install goes very smoothely with those and it will be my choice when I go with a 4" exhaust. (Currently straight piped stock) Anyway, there are too many variables to your question, did you want ALUMNIZED? 409 stainless? T304 mirror finish Stainless??? HEHE,, be specific!