Still messin' with the TPS settings, but I also noticed that it might be a good time to replace the air filter, I was thinking of removing the air box and just attaching a cone style filter. Actually cheaper then a drop in!

Questions: Can I do this with out an adapter on the '91 N/A and without a cold air box?

What size is the MAF flange? (3", I think)

 

Yes it can be done, I believe the size OD of the MAF is 2.5 (don't qoute me though). Most speed shpos will let you try a couple of filters "on the spot" till you get the correct size or you can measure it!

 

Running a pod filter without a heat shield is not recommended. Without a shield, temps measured at the air filter exeeded 60degC (140degF) on my car! This results in the power gained by the pod filter being lost due to the engine sucking hot air. It also increases the chance of detonation.2.5" inlet (no adaptor required), 3" outlet.