assuming you do nothing on a motor cept change from a t3 housing to a t4 housing for this instanse lest say were using a pt67 from a HO t3 to a t4 turnine housing and using the approiate collector to match it (t3 ramhorn to t4 ramhorn) what gains or diffrences can you expect?

 

Slower spool, less exhaust backpressure, more top end horsepower

 

thats it ? theres no big increase or benifit if there a big gain in hp or what

 

Way less exhaust pressure = being able to run higher psi and accually make peak power doing it. Not to mention pretty much shifts youre powerband later.

 

anyone care to add?

 

if you go with the pt67 with the .68 it is allmost identical as the t3/t67 H.O with the .82