@Michael Pickett said- "Thanks, Al. It's great to have access to folks with your kind of expertise!"
It's just the result of a rather mis-spent youth (way too much time in a friend's shop playing with VW's and drinking too much beer instead of going back to school!). It's nice to know it's good for something...
Anyway- 1st thing- I think you may find the exhaust not allowing the engine to develop it's full potential. IIrc that style exhaust is good to somewhere around 80 hp, while the rest of the engine has the capability to make fair bit more than that. A merged 1 1/2" system would be much better suited to the combo. Sorry I missed it the first time.
2nd thing- Well done with the evaporator box! It'll be interesting to see how the engine reacts to the added work of turning an a/c compressor- I've heard of smaller engines having trouble with air, especially at idle (or when returning to). A longer stroke crankshaft gives the added lower end torque needed to deal with the extra stresses involved. Plus, 2 (or 2.1 or 2.2 or...) liters is so much fun in these things!
Yoda out (for now,but back you know I will be!)