intrseting read if your intrested in modding a diesel, could i ask where or who did your remap? Superchips in Buckingham for the re-map and Powerflow for the custom exhaust they build it on the car as there are no aftermarket direct replacements, even got to choose the exhaust note!!! A couple of sessions before and after on a rolling road to gauge power increase. you can loose power if exhaust is not correctly made. A larger capacity exhaust goes some way to increasing the efficicency of the removal of the hot gasses from the engine. I was going to look at having 2 turbo's like the new C5, but the cost was stupid. These mods are because my last car a Subaru lagacy 2.5 twin turbo was so much fun but at 15 to 20 MPG, insurance group 19, stupid running costs it had to go for a more sensible car, sensible is so slow though!!