That was a fear of mine... I can turn it round and make the downpipe a bit of a ball ache, or, run a sidewinder style manifold like Graham. I am seeing how it fits on sunday with the bulkhead.
Results were:
Std 224bhp/fly
P-torque 278.0/fly
Std 175bhp/wheels
P-Torque 242/wheels
Std 219lb/ft
P-torque 302lb/ft
Why would you do that if you want an accurate before/after dyno comparison?