Try posting your questions at www.turbobricks.com

That forum is more active in the performance/tuning realm.

The problem is that the 16 valve is a somewhat rare engine, so there isn't much call for aftermarket parts for them.
The other thing is that it's already a modified engine right from the factory. Think about it this way: One of the most popular mods for any N/A car is to improve it's "breathing" -- which of course you'd achieve by altering cams and valves. Well Volvo already did that at the factory. They took a B230 (115hp/136lb/ft) and added a 16 valve head to it -- improving the stats to 153hp/150lb/ft (a pretty substancial increase).

I doubt the K & N filter will do anything for you -- studies show that they don't. The the difference between the turbo and N/A air filters is size. The turbo filter will not fit in an N/A airbox -- I presume the 16 valve has the same airbox as the N/A cars, but that's just a guess. The difference between turbo and N/A exhaust is also size. You may be able to fit a turbo exhaust system to your car, but you would need an adapter (I believe 2" to 2.25") -- you'd have to check it to be sure.

Hope this is of some help to you.

Good luck.

Jeff Pierce
--
'93 945 Turbo ( one kickass family car ! ) 197K miles, '92 Mercedes 190E (my daily driver) 170K miles, '85 Jeep CJ-7 w/ Fisher plow 225K miles, ’95 Lawn Chief