hp gain from TT dp vs. Stock dual dp

[bgr13@mn.rr.com (Ben Rogowski)]

I have a TT race down pipe and full 2.25" TT exhaust on my 16V.  The
stock HP figure for a 1.8l 16V AT THE CRANK is 123 HP.  With no mods to
my engine other than the TT exhaust I dyno'd 118 HP AT THE WHEELS.
Corrected for driveline loss, that figure corresponds to 136 to 138 HP
at the crank.  My set up does not use a cat.

Ben R
'79 Scirocco 16V

> I know switching from the toiletbowl setup to a dual manifold/dp setup

> gives a nice gain in power, but i was wondering how much of a
difference 
> the TT downpipe (to cat) makes versus the stock dual dp?