Personally, I'd just wait and get injectors at the time you're getting a tune. Then you can get 450's and be done with it, rather than buying 380's only to find down the road you want to do further mods and have to replace the injectors again. Which is what I did, I should have done it right the first time.

Adding 380's to a 17% without a tune just isn't worth it, especially compared to 17% with 450's and a tune. And the injectors--380's, 450's, or even 550's are close in price. But the 380's are the most expensive of the three, the 450's and 550's are the same.

 

I just got a 15%, I'm happy with it. Although I just got done posting a thread saying i couldn't immediately tell the difference, I just needed to wait for the ecu to adapt to it. definitely notice it now, haha. The car is just a lot more aggressive and snarly.

Although you might get a little more power from a 17%, I'm not sure 2% will make that much of a difference. Also, I like to rev high, it's one of the reasons I got an r53 instead of an r56.

 

+1 - This is what I had done and I've been very happy.

 

Well I feel stupid. Looking at the receipt from my mechanic, it appears he installed a 16%, not a 15%. I realize now I didn't exactly make it clear I wanted the 15%. Oh we'll, can't complain about the way it feels. If you're on the fence between the 15 and 17, try the 16 I guess, haha!

 

I've got a 2005 mcs w/ 17% and cai. No problems and its been on for 80,000 mi+.

 

anyone ever try the 19?