Its about tax return time and this year the exhaust system will get upgraded. I've narrowed by header choice down to either Doug's, Doug Thorley's or Ford Powertrain Applications. The question I have is about the rest of the system. Since it will go on a convertible, how well will dual 2.25" pipes fit as opposed to 2.5" in the driveshaft tunnel? Also, any real performance difference? If not I'll go with the 2.25". Didn't plan on using mandrel bends so maybe better to go with 2.5" pipes. What size do you think I should go with?