Post by
svard75 »
https://forums.nicoclub.com/svard75-u133637.html
Thu Jul 04, 2013 12:50 pm
Hey the OP started this thread for the M45's with the 4.5l V8. Don't derail to the little itty bitty V6's LOL JK.
IMO a NA V8 likes to breath. To open her up a bit more you have to widen things. Wider intake (Port and Polish - You can do this yourself just buy new gaskets), Wider intake valves and exhaust valves (Again Port and Polish, 5 angle valve job, extrude hone, etc - Unless you have a flow bench you'll need to have a performance shop do this for you), Lumpier cams (If you can't source anything new you can always have yours welded and ground down to support longer duration), Headers (either source already built 4-2-1 headers if you're planning on going with a nice big set of cats and pipes or 4-1 if you're planning on leaving stock diameter exhaust, or get yours extrude honed at a performance shop), Replace the cats with high-flow cats, eliminate any secondary resonators, replace the Y pipe in favor of an H pipe and you already have the cat back exhaust. Other than that you can invest in a 100 shot dry nitrous kit and lighten the cars weight.