I just had my se-r dynoed again after installing C2s and a 100 shot. I had the C2s set at +2 intake/-4exhaust. I did 3 pulls, the 1st with the cutout closed, 2nd with cutout open, 3rd with n2o. The car made 144whp/125wtq with the cutout closed, with the cutout open it made 149whp/127wtq. The biggest gain was made at 4000rpm which was 11wtq, followed by 9wtq at 2500rpm. It seems that a 3in exhaust makes more bottom end power than a smaller one. With n2o bottle pressure was at 900-950psi and AFR was 12.4-12.7 all across.
http://www.sr20forum.com/img/data/500/medium/91_se-r_dyno_SGP_small.JPG
For comparision here is my dyno with S3s and a 50 shot, all runs were with cutout open. http://www.sr20forum.com/img/data/500/medium/132se-r_dyno_2_small_.JPG
Also here is a dyno of my car with S3s set for -4intake/-4exhaust on the stock ecu. The first run is with the cutout closed and the last 2 are with it open. As you can see even S3s love a 3in exhaust! http://www.sr20forum.com/img/data/500/medium/dynopacksgp1.jpg

I just had my se-r dynoed again after installing C2s and a 100 shot. I had the C2s set at +2 intake/-4exhaust. I did 3 pulls, the 1st with the cutout closed, 2nd with cutout open, 3rd with n2o. The car made 144whp/125wtq with the cutout closed, with the cutout open it made 149whp/127wtq. The biggest gain was made at 4000rpm which was 11wtq, followed by 9wtq at 2500rpm. It seems that a 3in exhaust makes more bottom end power than a smaller one. With n2o bottle pressure was at 900-950psi and AFR was 12.4-12.7 all across.

Alwasys interesting to see dynos of SR20DEs with large cams.

And always, always surprising to see that a 3" exhaust makes more bottom-end power than a smaller one!!!

Can you post some blowup of those two runs? No NOS, just the 2 N/A runs.

What type of header do you have? And what cutout do you have? Where is it positioned?

Alwasys interesting to see dynos of SR20DEs with large cams.
And always, always surprising to see that a 3" exhaust makes more bottom-end power than a smaller one!!!
Can you post some blowup of those two runs? No NOS, just the 2 N/A runs.
What type of header do you have? And what cutout do you have? Where is it positioned?

I'd have to goto the dyno shop to get that chart. However I did input the values from each pull into a MS excel spreadsheet. So you can email me at nismo87@houston.rr.com if you want the files. The header I have is a hotshot gen VI, the cutout is a basic 3in one from summit racing. It is located right before the passenger rear wheel, about 1ft before the muffler (2k maxima).

I would like to see a S3 vs C2 chart.