I put new OEM coils in just before she turned 60 and noticed a slight improvement in most respects. As the coils have a habit of giving trouble I thought it was most likely to the new units having new insulation that was not in the process of breaking down. I was just going to change the rubber boots but found a deal that included coil packs and boots what the dealer wanted for boots only.

Ask them, I was just passing along the information as another option for tuning, that's all. As I said, I don't have their software on either of my M62 powered vehicles, so I'm just going off what I've read from others on the M5 boards.

No thanks. Everyone is entitled to their opinion, but mine is that selling a chip to tune a modern naturally aspirated vehicle is essentially a scam.

Yeah, you are not going to get much HP out of a chip/ecu flash for a modern N/A BMW engine. Some will raise the rev limiter and remove the top speed limiter as well though.

I think there is always a little wiggle room left just to be on the safe side, so I don't think it's a scam. I'm not sure what years you consider to be modern, but my 91 M5 came with 315hp stock, yet the chip I have bumped it up to 340. That sounds like a lot for such a simple chip, but it was literally a night and day difference on the M. My bike has software as well, and it's a huge difference. As for the X, the gains are only 10hp or so, which isn't huge, but probably noticeable nonetheless. IMHO, about the only scam here really is $$Dinan$$ and their pricing on parts, but as I mentioned, I don't doubt that there is always a little wiggle room left in software tuning from any stock ECU, BMW or otherwise.

While that can be considered both a plus and a minus, that's is what I got from the 2nd chip that I got in my M5.

It seems like there was more HP left on the table in the 1980's and early 1990's. Mid 1990's and on the gains started shrinking (with the exception of the new turbos). I think Conforti squeezes about 20 HP out of the new M3 with dyno sheets to prove it.

The dyno sheet on Turner Motorsports website shows a 2 lb. ft of torque and 3.5 HP increase for the X5 3.0 engine. Add the Conforti cold air intake and it bumps it to 7 lb. ft and 7 HP. Also, keep in mind that most of this HP is available in the second half of the RPM range.

On the 3.0, I'd only go FI and never look back.

I don't consider a 20 year old vehicle current, it is old enough to drink, vote, and be drafted. Another five years and you can put collector/vintage plates on it.

So, if we believe their dynos, and you want to get 3% more hp in the upper rev ranges, why not just drive at 3% higher rpm? That is free. To me, none of those very minor hp gains mean anything on the street unless you are at WOT, preferably at redline. My X5 never spent much time in that situation.