This is a before and after Dyno of my car. The only change was a "Dragon" Plenum and a Magnaflow catted "X" pipe.
Before-229 rwhp and 279.5 rwtq
After--241.4 rwhp and 289.1 rwtq
Gained--12.4 rwhp and 9.6 rwtq.
Catted "X"s are usually worth 4-5 rwhp and 4-5 rwtq, so I figure the...