Does anyone have the HKS exhaust (D1) pictured in the Stillen catalogue? This system looks identical to mine (it was on the car when I bought it). There are no visual marks or labels on my system, but the pipes are all stainless and the mufflers look like they are aluminized. The tips are 4" chrome and look the same as the HKS tips. Lastly, does anyone have a picture of a stock 91tt exhaust setup? Any help would be appreciated and possibly the difference between a stage I and stage II! Thanks in advance...Jeff