Sorry to hear the pump chain broke - this is the first time I've heard of that failure.

I think the aftermarket performace market for this car is very limited - most everybody that buys a 300D is looking for great fuel economy and low operating costs. No demand = no supply.

Like a previous poster said - this is not a small block Chevy - you are going to find some of the prices for parts on this engine absolutely breathtaking.

For example the stock pistons are something like $400 per copy, fuel injection mods can get pretty pricey as well.

Your stock engine has 120hp, after all your mods you might get it up to what? 160, 170 maybe 190HP?

Why bother? A V6 Camry will still be able to walk away from you...