M maxima New Member Oct 5, 2004 146 0 0 Apr 10, 2009 #1 Apr 10, 2009 #1 i have an 06 gt auto with intake, tune , mac axle back and 4;10s if i was to do a mid pipe xpipe ,catted or not ,not sure what wheel hp can i gain ? just with that ? and also if i did underdrive pulleys as well ? thanks
i have an 06 gt auto with intake, tune , mac axle back and 4;10s if i was to do a mid pipe xpipe ,catted or not ,not sure what wheel hp can i gain ? just with that ? and also if i did underdrive pulleys as well ? thanks
S seattlegt New Member May 3, 2006 82 0 0 Apr 10, 2009 #2 Apr 10, 2009 #2 5-7hp with the pullies and 3-5hp with catted pipe. Maybe 10hp without cats.