One last question, after the new motor I will be doing a custom exhaust from manni back. Is there any type of muffler that will flow well for na without losing a ton of back pressure?( I am buying a muffler and cat and custom all the piping.) I have searched the forums and sites like jegs, jcwhitney etc. and I don't really know what I am looking for. Any help would be very apreciated(SP?).