VY2 HSV headers vs PM Try Y's

[DarkCrystals]

Hey everyone,

Currently running VYII HSV headers on VZ clubby - LS2 M6. Cammed (VCM11) putting out 310rwkw. These are 1 3/4 Inch primaries into 2.5inch.
I have been given a set of mint condition pacemaker tri y's which are just 1 5/8 primaries with 2.5inch outlet. Worth changing over given the smaller primary or stick with the HSV headers? My car is a street car, doesn't see track or strip. Won't cost me a dime to change over.. have all the gear.. rest of the system is dual 2.5inch with H pipe.

Cheers..

 

[Not_An_Abba_Fan]

I'd leave it. For the 100 rpm down shift in torque it's not worth it. Also 4-1's sound better.