More Exhaust comparisons

My mate Humph has a nice old Mk1 with a similar spec engine but until recently a botch up 6-3-1 exhaust built in the same manner as most currently on the market ie completely unequal lengths built in the that'll do manner...
The crap 6-3-1 = ~100rwhp from a 2.7PI

Mike the Pipe version ~ very good but not perfect ~ good for +18 bhp measured at the wheels




Anyway when he put his car on the same dyno it struggled to make 100rwhp and its power/torque curve was lumpy as hell.

After I fitted my new GT manifold and system I lent my old Mike Randell system to Humph to help him out.

Compare the results (red trace is the "proper" 6-3-1). As GT says , some exhaust are more equal than others








This is Humph on the dyno before any mods.... the fact that he got 118rwhp compared to 128rwhp I think is mostly down to him still running an 8 blade mechanical fan and the standard airbox