I gutted the cat from my OEM midpipe yesterday.
04-28-2009, 12:56 PM
#51
Call me ROTO BAGGINS
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I'd like to see a 8 dyno'ed before I become a beliver(Kepping an open mind). Untill then to me it's like removing your airfilter from your stock airbox= more flow.
btw: I have two cats, one gutted and one thats not. I have switched back and forth. Their is almost no differents in noise but the gain is noticeable. If I could gain 1 more HP I would buy a midpipe. Untill then......
btw: I have two cats, one gutted and one thats not. I have switched back and forth. Their is almost no differents in noise but the gain is noticeable. If I could gain 1 more HP I would buy a midpipe. Untill then......
Again, the only real data I've seen in this thread shows that the gutted cat produces less power. I'm not sure how people can still argue this fact without bringing real data to the table.
And Bose, very interesting test with the filters as well. I agree that there's no way in heaven I'd remove the filter from my car!
04-28-2009, 01:16 PM
#52
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http://www.importtuner.com/tech/impp...ion/index.html
That's the link to the import tuner article where they test it on a Miata. With the cat intact, they get 104.1 - with the cat gutted they get 103.0. Meaning gutting the cat actually decreased horsepower by 1.1.
I'm not saying that what happens in a Miata has to happen in an RX8, but that's the only hard evidence anyone has presented thus far.
That's the link to the import tuner article where they test it on a Miata. With the cat intact, they get 104.1 - with the cat gutted they get 103.0. Meaning gutting the cat actually decreased horsepower by 1.1.
I'm not saying that what happens in a Miata has to happen in an RX8, but that's the only hard evidence anyone has presented thus far.
Ether way, id like to see proof of loss or gain, especially with the gains you claim on the gutted cat... I doubt itd be much if any
04-28-2009, 02:18 PM
#53
Why the **** would you remove the air filter. That's got to be the most asinine thing I have ever heard of in my entire life. Even if you gained 10 hp why would you risk getting all the **** that's in the air in you engine.
Oh wait, Import Tuner did a test on this: http://www.importtuner.com/tech/impp...wer/index.html
But they don't know anything do they.
Oh wait, Import Tuner did a test on this: http://www.importtuner.com/tech/impp...wer/index.html
But they don't know anything do they.
Relax and take your meds. Just an example of restriction.
04-29-2009, 12:35 PM
#59
Agreed, You have to try stuff to see if it works. My drag bike works better without a airfilter but It also has a pretty big stack on it.
05-05-2009, 02:08 PM
#63
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The reason was because I need to keep my car as quiet as possible (cops in my area are bad) and the only way to accomplish that was to gut the OEM midpipe.
I could have gone with a Mazsport midpipe but I did not like that you need spacers for the cross members.
05-05-2009, 04:42 PM
#64
05-05-2009, 04:48 PM
#65
I did not gut my cat because I could not afford a midpipe.
The reason was because I need to keep my car as quiet as possible (cops in my area are bad) and the only way to accomplish that was to gut the OEM midpipe.
I could have gone with a Mazsport midpipe but I did not like that you need spacers for the cross members.
The reason was because I need to keep my car as quiet as possible (cops in my area are bad) and the only way to accomplish that was to gut the OEM midpipe.
I could have gone with a Mazsport midpipe but I did not like that you need spacers for the cross members.
05-14-2009, 11:59 AM
#66
OK, its been awhile now since I installed a catless midpipe. I gotta admit theres more top end power. To the point where the vehicle revs past the redline(Easy) and sometimes kicks on the fuel shut off on late. The only minus was there was a rasp sound at around 2000 rpm. Belive it or not I got 90% of the rasp out by wraping the pipe with header heat wrap tape.
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