i have a 2.9 intense pulley on my car now, and i want to drop to 2.7 that i have..i know i need to machine the snout for this to fit, but what else do i need? 60s, retune.. cooling of some sort prolly exchanger and duel pass. i have a flowmaster cat back should i change down pipe or exhaust manifold? i mean i know it wouldnt hurt but could i leave stock dp and exhaust mani?

 

Yes 60's and an tune for sure. Get an heat exchanger and maybe also a dual pass will be great. I just had an h/e for cooling when I had an 2.7 and it pulled fine, but I didn't beat on the car all the time. I would deff. get an 3inch dp for the catback exhaust. But you can run a stock dp if you want but you'll see some false boost numbers some times

 

You won't need to machine the snout for a 2.7"

 

^this

 

OP:

I'll be dropping to a 2.7" pulley, 60's, and a Trifecta tune w/ GMS3 features very soon.

My supporting mods are intake, full exhaust (header, downpipe, catback), & cooling mods (front mount heat exchanger & Option B.)

I highly recommend making sure your exhaust setup is up to the task of handling the increased air flow produced by the 2.7" pulley. So def look into a header downpipe combo. Also, dont skimp out on the tune.

 

Not entirely accurate

 

You shouldnt need to machine the snout with a 2.7" pulley. I guess it could depend on which brand of pulley & hub you select though.

 

I had to on mine...wierd though

 

Mine had to be machined as well. I don't necessarily think it was due to the maker of the pulley as opposed to a manufacturing oddity. Just sayin it's on a case by case basis.

 

Good to know.

 

And knowing is half the battle

 

It sure is

 

GI JOE! Lmao

 

Let me add my question to this thread. Mods are in my sig and I am tuned for the 2.85. I have the zzp s3 h/e on its way, going for a 3" downpipe soon. If i were to drop down to a 2.7 would you think I'd need a retune?

 

I definitely would recommend it. Every pulley size down spins the s/c exponentially faster, so dropping from a 2.85 to a 2.7 is forcing more air than dropping from say a 3.0 to a 2.85.

 

intense pulley requires machining. i have intense kit now and have a 2.7 intense. thanks for the imput