I have an 03 cooper s bone stock except for a one ball mod and i know that this is not giving much power if any at all but im looking for something to put me in my seat a little more and befor i go and spend 2k on a pully exhaust cai and a tune and injectors is the 210hp enough to make me actually feel like im going fast while maintaining the peppy feel i have now

 

Start with just a pulley. It won't hurt the resale since it will be faster.

 

how much horse will just the pully alone give me

 

5psi more, figure 20 ish. It IS NOTICEABLE!

 

A 17% pulley will definitely make you kick yourself for not doing it sooner. The difference is noticeable.

 

I myself, would work my way down to a smaller pulley. Start small, and go smaller. If you just throw a 19% on it, to me, it doesn't seem safe for the motor or sc. It's going from spinning a little, to a whole bunch. I would work the engine up to it.

 

and i can do the pully with no other mods? and with the diy cold air be worth it

 

make sure if you install the smaller pulley to also install colder heat range spark plugs as well. I would recommend the kit that Way sells which includes pulley, shorter belt, colder plugs, tensioner stop and I believe a pulley puller rental.