I would like to do some performance upgrades.
I added a K nad N cold air intake, and cone filter.
Changed plugs to NGK Irridium.
Is there a chip to upgrade performance?
How much will it help to change my mufflers, and what brand is best?

I would like to do some performance upgrades.
I added a K nad N cold air intake, and cone filter.
Changed plugs to NGK Irridium.
Is there a chip to upgrade performance?
How much will it help to change my mufflers, and what brand is best?

best bet is to call thrasher performance. do a search they have a web site and see what is interchangeable w/ a grand prix or monte carlo.. you won't find any specific riviera aftermarket applications or if you do let me know