Jet Chip in a BMW.. issues??

I am looking at Jet Performance for the chip update in my 745i. Supposedly, this offers 20-22hp and improved throttle response, better shifting characteristics, etc.

Questions :

Has anyone tried this? What results? Any issues?

Will this affect my warranty?

Thanks

I don't know about the Jet Performance chip specifically, but I changed the chip in my '93 740iL and it helped just as you describe with improved throttle response, better shifting characteristics, and I assume some horsepower gain-much better overall. I bought mine from a guy on ebay who didn't even know the brand name, just that it was made in Germany.

As far as the warranty goes, hmmm, maybe want to check with your dealer but my guess is that it would void your warranty for engine related issues. I imagine that anytime they hook up their engine diagnostic equipment it interrogates the electronics to find out what version you have, so I think they'd notice. If your state or locale has smog control testing there might be some issues there as well.

To what extent will Jet Performance stand behind their product?

The BMW solution would probably be to trade for a 760iL.

The following is an addition to my response. It came from the Jet Performance website:

Will JET Performance tuning void my warranty?
No. Federal law prohibits a dealer from voiding your warranty just because you are using aftermarket speed equipment, with only two exceptions: the warranty can be voided if the aftermarket part causes damage or adversely affects the emissions or the emissions system. In recent documents produced by the SEMA (Specialty Equipment Market Association), a trade association-representing specialty automotive parts manufacturers, and the following quotes have been extracted:

"The vehicle manufacturer is not allowed to void the vehicle warranty just because aftermarket equipment is installed on the vehicle. This protection for consumers is the result of a parts self-certification program developed by the Environmental Protection Agency (EPA) and the Specialty Equipment Market Association (SEMA).

"Under the program, if a parts maker completes the EPA process of self-certifying its parts, the vehicle manufacturer cannot void the warranty even if the certified part has failed and is directly responsible for the warranty claim. In cases where such a failed aftermarket part is responsible for a warranty claim, the manufacturer must arrange a settlement with the part manufacturer, but the new vehicle warrant is not void under the law.

"If the failure to honor a claim involves the new-vehicle warranty, and it appears that the manufacturer is improperly denying a claim, the incident should be reported to the Federal Trade Commission (FTC). The FTC is responsible for monitoring compliance with the warranty law; the agency's telephone number is 202/326-3128."

Are JET Performance Chips emissions legal?
Yes. All JET Performance Chips and most Performance Modules are 50 state emissions legal. ...