So Loz, what do you recon we will be getting from the GS then. Its 400bhp stock, and we have the Larini free flowing exhaust and de cat, so that must count for 20hp so plus the 30hp from the remap, we should be pushing out more horses than a standard GTS. Now on another level, this makes me look at the the GT 4.2 again. Spend 2.5k on an exhaust and remap and you have a car that will technically be faster than its bigger brother.
What do you recon?
My experience Matt is that you generally can't add the increased BHP figures together for each modification to achieve an accurate figure. The increases quoted are usually for that single modification on a standard car. With other mods the waters get muddied a bit. The only real way of discovering the improvement of each modification is to dyno before and after each one. From what I've read it appears that DMS will do this for you as a matter of course to demonstrate the difference. If I was going down the Larini + FD + whatever route I'd be tempted to spend a few quid at a friendly dyno to get a before and after reading to see what my money was buying me. The other consideration is the 'seat of pants' factor which is all about how a car feels to drive, something difficult to measure.