to be perfectly honest i have yet to install the 75mm body, i have it on order. i can cancel my order on summit if you have a good suggestion. One of the biggest things i would like to do asap is the exhaust seeing as my model has a y pipe to single and i can really tell its holding back alot of power. i assume by "pi" you mean police interceptor? thank you. thank you for the compliment on how clean she is,hahaha. one of the biggest factors in buying this car was of how good of shape it was in for being 10 years old. plus its only got a wee bit over 100,000 mi. on it. and for being a minnesota car it has zero rust.