I don't see how you could fit anything bigger than the 3.6 without hacking up the car. The 3.6 is tight(and the 4.0 whipple I assume). You would have to move the drive belt out or firewall back.
anyone heard anything positive on the new 4.2LC Kenne Bell for the gt500s? that might be my huckleberry!
anyone heard anything positive on the new 4.2LC Kenne Bell for the gt500s? that might be my huckleberry!