wich is better a 4-2-1 headers or 4-1 headers cuz i found out a used hks 4-1 headers for my cars so what do u guys say?

4-2-1, I would say, but it depends on a lot of other factors!

like?

4 to into 2 into 1 is better for torque all round and reasonal hp
4into 1 is better for higher up in the rev range for hp but you loose low down torque
at the end of the day the altezza is nearly 1.5 tonnes stick with the std system of 4/2 /1
or you will be reving the bee jesus out of your motor

thanks for the info i didnt go with the deal, what i want is more torque at low end

fit a camcon unit if you want low down torque

I saw massive gains between 3000-5000rpm good value for money IMO

fit a final drive gear reduction

yeah that'll help to

anybody got any ideas on how you would go about recalibrating the speedo cluster with this kit fitted as everything will read over ????