alfasud.ti

I agree with gotcha. Your choices are:

1. Remove secondaries, cut away precat housings and replace them with plain curved pipes.
2. Replace whole exhaust manifold (both primaries and secondaries) with one from an early 156 2.0TS Euro II. You'll need some work to be done to the exhaust midsection because the 156 manifold is longer but the gain will be significant. And while you're at it fit a 200cpsi metallic main cat.
3. Same as 2 with a good aftermarket manifold like SS or a custom-made one. More expensive but (slightly) more effective I believe.

In solutions #1 nd #2 you will have to make inserts for the lambda sensors on the secondaries at approximately the same spot they were on the stock precat housings.

I have tried solutions #1 and #2. Solution #1 may cut the stock ceramic main cat's life short. Mine lasted for 40,000kms after removing the precats. After that I went to #2 along with a full cat-back exhaust. Gave me an extra 6HP dynoed at the wheels (147 1.6TS).

"Black holes are where God divided by zero." - Steven Wright