I only have a dropin filter and a mod'd OEM muffler to bypass the flapper valve and a tune. On 91 octane, i'm making 289whp and 313 torque on a Dynapack dyno. On a Dynapak, the SST's clutches will start slipping around the 330-340 torque mark. SST can handle more horsepower, but just can't handle the torque. I don't plan on doing much more to the car since i don't feel like breaking a $10K tranny. Plus i'm getting "old" so that why i got the "Old man's evo"