Boost question
 

Hi Guys,

Just a quick question for you all.

I had full boost when I bought my Saab 93 Aero. Boost needle would go up to the tip of the red / end of the yellow in 2nd, 3rd, 4th and 5th.

Since then, I have changed the air filter to BSR with a heatshield, changed the BPV to a forge piston one from elkparts and replaced all vac lines.

The car has just been fully serviced and oil pan checked - no problems.

Any idea's why I am not getting full boost?

Also, the car seems to have less torque in low rev's but better pull at higher revs - is this to do with the air filter that i changed?

Thanks,

Johnny