I just got the Signature Motoring performance intake for my 1988 325i. HIGHLY recommended. I did about 120 miles today from Long Beach to Sun City, CA. today. Engine howls at high RPMs with noticeable power increase and acceleration. Only downside is they took about a week to ship due to adaptor being out of stock, but well worth the wait. Best $160 I've put into the car so far, and I've put in quite a bit. LOL.