My Tezza under powered?

[ryonan]

from aussie forum, recommendation to improve low torque:-

1) HKS 4-2-1 extractor
2) thermal wrap the extractor
3) S-flow muffler such as TRD or TOM's
4) upgrade ECU..cant remember which one..

anyone using TRD or Tom's? Can give feedback on the performance compared to stock or straight flow?
for sure, these mufflers are freakin expensive..!

 

[Greytezza]

It is not advisable to thermal wrap your extractor coz in the long run, this will damage the extractor..(cracks will appear).
As for HKS 4-2-1 extractor, it is only for the 6 speed MT..5AT very little options.

You will have to mentioned if the above mods are for 6 MT or 5AT or for both...