buy decision though fallen, still need help

hi, had let me know about a purchase decision of you. so from 01.2009 it will be a SLK 280 roadster/coupé. with full satisfaction (comand, leather, tel., xenon etc.) now a simple but yet complicated question lies me: since I could already hear the sound of a SLK 280, which I don’t feel, there will be a change to the SLK 55 AMG exhaust, the problem: the series-system is broken up and dismantled with the flex. the first question, where will this cut off n? the new one is welded, good. there are 4 variants, which is the question, which would be worthwhile to make a conversion. the vehicle is financed and so be in possession of us around the 5 years. a retrofit, since the vehicle is sold at some point, would have to be feasible. the rear apron is the decisive problem. the FL model without AMG has a diffuser, you couldn’t just cut it up, right? the AMG styling models are just price-free 5.000€ more expensive than the seri e, optically all the more beautiful, it would be a pity if you had to cut the AMG rear apron so capput with it. during the retrofit this would just look bad.. until 04.2008 Pre facelift until 04.2008 Pre facelift AMG-Styling from 04.2008 Facelift from 04.2008 Facelift AMG-Styling has jmd. possible experience? cost me with so about 1500euro. http://cgi.ebay.de/…Benz-NEU_W0QitemZ250226713037QcmdZViewItem?… – see if that makes sense to buy. thank you, pheeR