challack doesn't have his own company anymore...he and par are the same now...he still designs the sets though...they seem to have manufacturing flaws often as the number of sub 400whp cars breaking them, yet they still manage to be in the fastest subies in australia...
not to long ago I got rid of my par straight cut dog box for fear of destroying them...that and gerard said they wouldn't hold my end goal

modena's are nice and are on the roger clark motorsports "gobstopper" but a 6-spd set. Shawn Lozy still has a set in his car that made 600 but has been sitting for the past 2 years...hollingers are quite nice and are slide on, not press on...andy forest is actually running them in his 9.1 second scoobie.

ppg's are a great bang for the buck...the 5-spd dog box can only handle 800...if you want more than that, you need a built 6-spd