Have you considered building your own headers? You would need to acquire flanges, which can be had for individual ports or as a single flange for each side, and also collectors, which are available in a variety of sizes. Then you just buy mandrel bent J-bend or U-bend exhaust tubes from some place like Summit and butt weld them together to form the primary tubes. It's not that difficult to do, and then you can really take advantage of the extra room in the engine compartment by customizing a set for your car. I don't know of anyone who makes a set of headers specifically for a shock tower delete car, so to really optimize the headers making your own might be the only option.