here is a post made a few days ago, might be something to consider.....it eliminates the u-bend, cost I saw on e-bay was about $220.00.

 

Thanks man, top swap is replacing heads, lower intake, installing a sc, pulleys, wiring etc. More less when you top swap you take a stock top end of a already sc engine and install it on yours.

I say leave the resi or replace it with a glass pack. The cat will be replaced if you buy headers.