Which would you say is a better combo:

T3 T4 combo or T28 T4 combo.

I ask this since the T28 will spool faster than the T3 and the T4 will have spooled by about 3500-4000 RPM depending. What do you think?

Gah, does nobody care? I want some input here! At least vote.

DEFINATELY the t28/t4 combo. t28 spools quite a bit quicker, actually and in a sequential setup quick boost is the ONLY goal with the smaller turbo. Don't need it to make a lot of power at all. Just needs to make whatever power it's going to make QUICKLY. Let the bigger turbo "do it's thang":D

depends on the T28 most are T-3 compressor wheels carved to fit in the stock .48 a/r T25 compressor housings. It effectively eliminating the diffuser section of the compressor housing. A little less than half of compression takes place there. all and all a t/3 t/4 combo is over 80% effective when utilized correctly. So you guys know where I stand T/3 T/4 combo all the way.

Hmm, well that is quite interesting. I didn't know that, I guess you do learn something new everyday.