i know the search is my friend....for the last hour ive been looking at spacers and mrev threads/posts, but no one ever mentions about the sedans and if i need to tune after a 5/16 isothermal,also if the m rev is even needed with the 260 non rev engine. i know it gives gains but i dont want to have to re-tune. i have an 04 6spd sedanwith custom cat back and knn drop in.....should i stick with just the iso 5/16 or what......also any one live close to o'side (san diego)?

 

you can use the 5/16 Spacer... all you need to do is reset your ECU https://g35driver.com/forums/engine-drivetrain-forced-induction/6526-easy-ecu-resetting.html

 

+1

Go with the 5/16.