i just order 2 magnaflows 14829 street series muffllers.......since i will do a custom piping at the mufflers shop.....i was wondering should i go with the 2.25 or 2.5 piping........my car is a 2000 gs300 stock n/a........thanxs

 

You should go 2.25" if you are staying NA. JBrady has posted some interesting thoughts on it - search his username.

Jonny