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Race Exhaust

Old 05-19-09, 04:52 PM
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Race Exhaust

Hey gang,

I am currently looking at replacing parts of the exhaust on the track car and am looking for thoughts and opinions.

My current setup is a Racing beat 2-into-1 header, the matching RB pre-silencer and a CorkSport single exhaust.

http://www.racingbeat.com/resultset....rtNumber=16131
http://www.racingbeat.com/resultset....rtNumber=16408
http://corksport.com/store/large/fjs...o_NA_80mm.html

The problem is that it is just too loud. Like bleeding-ears loud. Turn-down pipes just ain't gonna cut it - I can't pass sound at the track. Right now I'm having to use the CorkSport silencer insert to get things down to a reasonable level and it's just killing my power.

http://corksport.com/store/large/fda..._Cat-Back.html

I've been thinking of replacing the CorkSport with another canister, possibly a 3-inch Magnaflow or one of the RB units. Does anyone have a good suggestion on how to approach this?

Thanks,

-b
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Old 05-19-09, 05:15 PM
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What sound level are you trying to make?

I think you know that is not the best exhaust setup posted above. FWIW, there was a true dual RB header for $50 or the ISC stainless header for $125 on another forum recently, not mine but a super steal and worth grabbing if in the budget (and still available) . ISC used the Magnaflow muffler in their setup.

I have a 3" RB universal presilencer collecting dust with only one weekend on it. It has a couple inches of 3" pipe welded on both ends. The welds are nasty, someone else welded it for me. I'll make you a deal if you want (too lazy to ever post stuff for sale) - http://www.racingbeat.com/resultset....rtnumber=16435 Also believe I have a 2-1 collector setup for 3" exhaust. They RB presilencer should work, in fact with the RB presilencer and a Magnaflow I never had problems, that was with the Mazdaspeed header. I had another RB presilencer that I tore up off track, thus the reason for the one above before I went to the full ISC exhaust.
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Old 05-20-09, 10:57 AM
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Correction to my last post: Replace Magnaflow with Dynomax Ultra Flo. I don't know what I was thinking, both my setup and the ISC one uses the Dynomax. I have a non RX-7 street car with a Magnaflow.
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Old 05-20-09, 11:55 AM
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I use a 2.5" mandrel bend single exhaust custom made by my cage guy, into a magnaflow. It's loud. Without a helmet, it's ear bleeding loud I pass 106db OK, but 92db at Laguna, forget it. I've been asked to not come back to some private track days cause my car is too loud (sheesh cry me a river, those private track day guys can be pr**ks)

I'd agree with the presilencer, I don't think simply swapping out the muffler is going to be enough.
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Old 05-20-09, 12:46 PM
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we used to run the RB TURBO BACK pre silencer, the one from the turbo back 3" system. and a magnaflow can, DB was in the mid 90's, at the track it was quiet
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Old 05-20-09, 02:10 PM
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Thanks for the advice, guys. I'm looking at some options right now - everything from the drastic (replace everything from the header back) to more incremental (replace the RB race-pipe or the Corksport, see if it's enough, later, rinse, repeat).

Sound level at VIR is 103dB. Not sure about others in the area.

-b
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Old 05-21-09, 10:56 AM
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Originally Posted by wrankin View Post
Thanks for the advice, guys. I'm looking at some options right now - everything from the drastic (replace everything from the header back) to more incremental (replace the RB race-pipe or the Corksport, see if it's enough, later, rinse, repeat).

Sound level at VIR is 103dB. Not sure about others in the area.

-b
in my experience, id say the CS muffler is louder than just pipe

actually lol, a couple FC's ago i had an n1 dual, and it made no difference weather it was actually bolted to the cat or not, as far as noise
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