I'm in the process of gathering parts to build up a performance exhaust for a built 3.1L M20.
I currently have IE long tubes (with 2.25" collectors), a Stromung rear section, and a collection of pipes, U-bends, J-bends, v-bands, an X pipe, and a Borla XS auxiliary muffler.
Aiming to run catless dual 2.25" back between the two, using the intermediate muffler to quiet it down some and get rid of the drone its current (shitty dual to single to dual) exhaust has.
I'm struggling to find useful or conclusive information about a couple things, because exhaust design seems to be another version of the "what oil should i run" question.
1 - Is there a particular place that is known to be good to put an X pipe for this header and displacement configuration? From looking at the OEM exhaust designs, the X is typically directly under the shifter. Interestingly, cheapo aftermarket long tubes usually come with an X section that attaches almost directly at the ends of the collectors, which seems like the complete opposite extreme placement-wise.
2 - the muffler I've purchased internally crosses the two exhaust streams. Is there any use for having a discrete X pipe section in addition to this? Should I aim for two separate 2.25" mufflers instead?
3 - the Stromung rear section has 2" pipes, I believe. Any expected issues due to the stepdown from 2.25 to 2?
4 - O2 sensor placement. I've read a bunch of various things saying that it's best to put it near the collectors, but without doing a X or an H it'll only read one bank. This seems more or less fine, but what are the downsides of putting it further back? Cooler charge?
cheers
I currently have IE long tubes (with 2.25" collectors), a Stromung rear section, and a collection of pipes, U-bends, J-bends, v-bands, an X pipe, and a Borla XS auxiliary muffler.
Aiming to run catless dual 2.25" back between the two, using the intermediate muffler to quiet it down some and get rid of the drone its current (shitty dual to single to dual) exhaust has.
I'm struggling to find useful or conclusive information about a couple things, because exhaust design seems to be another version of the "what oil should i run" question.
1 - Is there a particular place that is known to be good to put an X pipe for this header and displacement configuration? From looking at the OEM exhaust designs, the X is typically directly under the shifter. Interestingly, cheapo aftermarket long tubes usually come with an X section that attaches almost directly at the ends of the collectors, which seems like the complete opposite extreme placement-wise.
2 - the muffler I've purchased internally crosses the two exhaust streams. Is there any use for having a discrete X pipe section in addition to this? Should I aim for two separate 2.25" mufflers instead?
3 - the Stromung rear section has 2" pipes, I believe. Any expected issues due to the stepdown from 2.25 to 2?
4 - O2 sensor placement. I've read a bunch of various things saying that it's best to put it near the collectors, but without doing a X or an H it'll only read one bank. This seems more or less fine, but what are the downsides of putting it further back? Cooler charge?
cheers
Comment