Am i correct to assume....
 

that my HX40 is a 1.05 A/R (14cm?) i know my HX60 is a 2.34 A/R (32cm)...

I was told the smallest HX40 is a 16cm exhaust housing in the T3 flange configuration...

But i feel such a small difference in spool-up, that i can't beleive the exhaust housing is that much bigger...

I have near none pre-boost smoke, and it will still light well within the 2000rpm range... even in 2nd gear !

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Take note that my HX40 is Wastegated, i'm under the impression that there are smaller exhaust housings on wastegated HX40s than nonWG ?