Reviewed By ben d (NEWNAN, GA) Reviewed for a 2005 Jeep Wrangler —2/10/2015 8:37 PM
improves the sound when accelerating. Haven't noticed much of an increase in mph(wasn't expecting much anyways). Definately increased horsepower.
Reviewed By Stanley B (VERNON, AZ) Reviewed for a 2013 Toyota Tundra —2/25/2015 7:02 AM
They seem to work. The Volant cold air intake & this seem to have lowered the rpm buy about 200 @ 65 MPH. the hill climb in cruse is really noticeable, a whole lot smoother, again not as abrupt down shift. I chose the spacer because of the air intake. The install is straight forward. Auto Anything has the best deal & is a fast shipper. I hope the info. is a help in your decision.