[427Aggie]

Some of the ones I have seen are the large K&N Filters..but to fit under the hoods you need to have a drop base made for the air cleaner...Rob at Keith Craft Motorsports has made a few for some of keith's cars...he can speak more to what the small 8's will do to your power...Also what mufflers are in the pipes..you should see some of the ones that have been taken off...Rob has a brand he replaces SPF's with and gets quite a HP gain.

Matt