5-Series (E12,E28, E34, E39, E60)Chat relating to the BMW 5-Series of all generations. Specific models include: BMW 518, BMW 520, BMW 520i, BMW 530i, BMW 528i, BMW 530i, BMW 518i, BMW 524d, BMW 525i, BMW 525e, BMW 528e, BMW 540i, BMW 535i, BMW 520d, BMW 525td, BMW 525d, BMW 530d, BMW 525i/xi, BMW 530i/xi. (BMW 5-Series Forum)
CAI's are tricky for the 540. In my research I've not run across any cases where someone thought they added any HP by adding the intake. On the contrary, most findings were neutral or in the negative about performance. To make matters worse, your Mass Airflow (MAF) sensor is very sensitive (and expensive) and doesn't like ANY excess filter oil flowing onto it.
I hate to be a buzzkill, and I used to put a tube intake on anything with an internal combustion engine, but I'd advise caution on this one.
Dinan is always a sure thing, but if Dinan is too expensive for you (and who isn't he too expensive for?), I recommend you try some other well-known vendors before resorting to no-name e-Bay stuff. RevHigh Motorsports is located near DC and is owned and operated by a 540 guy and I think he markets a nice intake I've considered from time to time. Try him (do a search via google or on the Roadfly E39 forum).
__________________ <span style='colorurple'>Eric S.</span>
2006 Honda Odyssey EXL-RES
2006 Honda Accord V6 EX-L Sedan
1999 BMW 540i 6-Speed (Sold to M3UOND on 9/21/06)
1991 Honda Civic Si - Occasional Beater
The AutoGuide.com network consists of the largest network of enthusiast-owned enthusiast-operated automotive communities.
AutoGuide.com provides the latest car reviews, auto show coverage, new car prices, and automotive news. The AutoGuide network operates more than 100 automotive forums where our users consult peers for shopping information and advice, and share opinions as a community.