I think a srt4 downpipe is the same as a stock dodge neon downpipe, yes/no? I once pulled out a stock one and compared to a srt4 and both looked the same in size, even the inner chambers. Let me know, if someone out there knows the differences. Might be just the name...

 

I think they are similar.

Problem is most aftermarket or upgrade parts for the srt-4 offer a downpipe with a resonator instead of converter for the srt-4, also they use 3" iirc.