Just got back from my home track (Thunderhill) where I was able to test the ACE Header and CSG spec SRC coil over suspension. Knocked a full 3 secs of my best time and after looking at the data there was some traffic in that lap so there was definitely more improvement beyond that (probably 1-1.5 sec or so).
The results(red) vs the last time I was there with stock header (blue):
In terms of acceleration I had the same accel down the straight as:
E36 M3 (gutted)
S2k (modded)
BMW 228i (looks like this puts down 225 whp 240 ft-lbs on dynojets and weighs 3300 lbs). I also noticed I started gaining on it towards the end of the straight where you tent to sit in higher gear / higher rpm.