nxcess00

Ok thinking doing a pulley mod for my 03 cobra...

What is everyones suggestions ?

And should i do new a Idler Pulley Kit a Blower Belt Tensioner ?

Whats the best manufacture of the above products that I should use ?

-Thank you everyone for your help ! This forum is great !

-Nxcess

xxkazp3rxx

I didn't buy my pulley, nor do i know the manufacturer name.. but i always recommend a 2.81... reason being, is that you're not really losing much boost if any by staying at a 2.81 vs 2.76, but you won't have as much pulley slip... I never had any slip with my 2.81... You could always do a 2.93 with a 4# lower pulley... your hp numbers won't be as high, but your tq will improve and give you a better power curve all around.....

Blownsvt

i always reccomend billet flow pulley do the 4pc idler set as well. it is worth it. for an unported blower i would got with a 2.76 as that will give you the most gain.

xxkazp3rxx

less then 1 psi difference between the 2.81 and the 2.76, but a whole lotta extra heat....

antiv6

id get the 2.76, i have no belt slip at all

562cobra

what about the 2.65 from reichard racing or some name of some sort?

antiv6

if i did it again id probably do the rr one for a bit more power, with all the bad posts about lower pulleys breaking cranks id go with the smallest upper you can

562cobra

the 2.65 will add how much psi on top of stock?

2k6silvergt

Probably 7-8 psi more.

2k6silvergt

I would go with billetflow upper and idlers. Do a 2.76 if you are just doing an upper or a 2.93 and 4lb lower.