I understand why longtubes are better for performance, but aren't they a problem for emissions? I thought that since the O2 sensor is further from the engine, it didn't get hot enough to read accurately.
Here in Dallas, the testing just got more strict, so it's harder to "work around" the issue.
My car is lowered 2 inch's and I have 18's on it. I installed some longtubes and rubbed on many a speed bump. I ended up going with shorties. I would only go with long tubes if you plan to frequent the track often.
I have quiet a few friends with lowered fox bodys and longtubes, lowest being nearly 2 inches, and they say be careful on speedbumps, and driveways, otherwise you will be ok most of the time. The lowest Im going with my longtubes will be 1 1/2 " drop. To answer your question, the long tubes will give you better performance, and better sound!
My car is lowered almost 2 inches and my long tubes rarely scrape. Ive always heard that a shorty header was best for a motor that didnt have heads/intake setup though. I put shorties on my coupe when I first got it and it improved it alot.
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