After ready countless post on this matter I'm still not sure what is a better way to go. First thought a 15% pully by it self, then after reading and talking to some I thought a 16 % plus a 2 % was the way to go, then thought just a 17% by it self. I am on the street 90% of the time and am concernd with the combo of the two pulleys. My car is an 05 with under 9 k. Any thought's ? LOL .

 

16% with 2% is what i'm going to do after talking with people who have done that and just a 19%.

 

I just bought the Alta 17% V2.0 I'm waiting for Dec 19th install date:impatient

 

I forgot to ask Peter at M7 what there pulley is made of. Is it SS ?

 

-15% +3% is nice. It prevents slipping belts like the 19% can have at high RPMs. I also did the Altarnator (+5%), does not change the -15%+3% ratio. Less mass to turn and makes the alternator happy.

Bomboasy

 

If I were to do it over again, I would probably do a -16%+2. Good balance of power and speculated reliability.

 

It's all SS...

Peter
M7 Tuning
562-608-8123

 

I have the M7 16%+2% combo, I have had no problems and I think it's perfect to run everyday on the street.