What is the max HP that the factory Gill Style exhaust can handle?

Thanks 30, Im running a blown 509cid motor around 650 hp. Did you Dyno with that exhaust or another type?

I'm sure a N/A motor is hurt by them more than a blown motor would be.............

Thanks, looking for a bigger cam now

I run a 540 with crane 741 cam and figured i was choked a little by the Gils, dry (sounds like my merlin heads might be my only issue)- I'll have to try and find that info.......

Is this the data you are looking for?
Kent