down pipe
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[SOLVED] How do I avoid a CEL with a catless DP?
Just installed my turboxs catless downpipe and racepipe on my 09 gen 1 speed3. It sounds awesome. However, roughly 30 miles after the install, 3 miles into the third drive after the install (which I didn’t let it sit and warm up because I had to get somewhere), it threw a CEL with a P0421 code...- originalmarshmello
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- catless cel down pipe gen 1 p0421 speed 3
- Replies: 18
- Forum: Mazdaspeed 3 General Discussion
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Should I replace my downpipe gasket when upgrading? + tuning question
I have a turboxs downpipe and testpipe I plan to install soon, but want to avoid any leaks. For those wondering, yes I have upgraded HPFP internals. My car (2009 gen 1) has 155k miles on it, with I believe the original downpipe gasket and exhaust gaskets. When I bought the DP, the guy threw in...- originalmarshmello
- Thread
- catless down pipe downpipe exhaust exhaust leak gasket gen 1 racepipe test pipe testpipe
- Replies: 3
- Forum: Mazdaspeed 3/6 Engine