I had a tuner chip on my 99 v10 and it realy made no differance it did drink more gas I would up grade your exhaust I am in the proccess myself and did want to ask v10lvr did you go with oem cats or after markets and you are right on coasting down them hills still gotta luv them v10's
Originally Posted by v10lvr
I havent heard of anyone having much success with real power increases using tuner chips. A few guys i know with V10 / automatic trannys have had a small amounts of success with their shift points but they also said it kind of hurt their mileage. I woke my 96 V10 up with two new cats, into a single Magnaflow Muffler exiting thru a 4" tail pipe and a K&N intake...It sounds great, really tows my 22' boat like nothing, and will pass anything on the road but a gas station. The only way to get more than about 11 miles to the gallon would be to coast down hill ALOT!!!