AHHHH YES....
I just got my flash reprogrammed ECU from IPD. There are several differences between a "chip" upgrade and the ECU reprogramming. Not sure exactly what the chip does specifically... but the IPD deal changes engine limiting, fuel mix, turbo pressure, and i think some other things...
Also, this is completely and easily reversible, where as I don't think its possible or maybe just not as easy to undo with a chip.
Anyway, I just mailed my ECU away using (took it out using a tool they sent me) and it came back a day later... popped it in.. AND OH MY GOD
Theres so much new torque that my wheels light up in the top of first, and then AGAIN in the bottom of second. The 3 extra PSI of turbo are really noticeable... its like my c70 just woke up from some kind of beauty sleep.
The air filter is also easy to do.. and the exhaust from what I'm told by my ***** friends is simple for an experienced mechanic to do as it is just bolt on as opposed to welded. So I'm skipping the dealer and going to a performance honda mechanic that my friend trusts.
hope that helps....
ps - i have the 99 c70 HPT