The only way to get an HHR to keep-up with an SRT-4 is to build a 2.0L turbo or supercharged ECOTEC out of the GM Performance Parts catalog and bolt it to a modded 5-speed transaxle with an LSD, HD clutch and bigger axles. It would help to have a good set of coilovers and sway bars to navigate corners as well.

 

lol, what did you expect? be wary of pt's as well, the gt turbo will hand you your arse as well! the srt4 is a great ride, i sold my 2004 to get an escalade as the srt4 unfortunately did not have the room i need for my job. the car was wicked fast.