Exhaust system
Thread Starter
Junior Member
Joined: Sep 2020
Posts: 12
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From: chatham virginia
Exhaust system
so I got this 87 rx7 na and im looking at exhausts trying to find out if anyone has ever done 2 mufflers and how it'd workout in the long run or if it'd enhibit performance a lot
Rotary Freak
Joined: Jul 2016
Posts: 1,838
Likes: 597
From: Beeton, Ontario
Two mufflers as in a dual exhaust or two mufflers in series with one exit?
The stock exhaust is a dual exit and so are many aftermarket options. Some go to a single with no loss of power. It's up to your aesthetic preference, but single is hypothetically lighter.
As for putting multiple mufflers in series, the stock exhaust goes through three cats in sequence before splitting to the mufflers. Plenty of people also use resonators or presilencers even in performance exhausts. I see no reason you couldn't put two mufflers in series as long as they aren't restrictive on their own and are appropriately sized.
If you want something off-the-shelf and reasonably quiet, go for Racing Beat. All the other options I have heard (other than stock) are fairly loud.
The stock exhaust is a dual exit and so are many aftermarket options. Some go to a single with no loss of power. It's up to your aesthetic preference, but single is hypothetically lighter.
As for putting multiple mufflers in series, the stock exhaust goes through three cats in sequence before splitting to the mufflers. Plenty of people also use resonators or presilencers even in performance exhausts. I see no reason you couldn't put two mufflers in series as long as they aren't restrictive on their own and are appropriately sized.
If you want something off-the-shelf and reasonably quiet, go for Racing Beat. All the other options I have heard (other than stock) are fairly loud.
Thread Starter
Junior Member
Joined: Sep 2020
Posts: 12
Likes: 0
From: chatham virginia
Two mufflers as in a dual exhaust or two mufflers in series with one exit?
The stock exhaust is a dual exit and so are many aftermarket options. Some go to a single with no loss of power. It's up to your aesthetic preference, but single is hypothetically lighter.
As for putting multiple mufflers in series, the stock exhaust goes through three cats in sequence before splitting to the mufflers. Plenty of people also use resonators or presilencers even in performance exhausts. I see no reason you couldn't put two mufflers in series as long as they aren't restrictive on their own and are appropriately sized.
If you want something off-the-shelf and reasonably quiet, go for Racing Beat. All the other options I have heard (other than stock) are fairly loud.
The stock exhaust is a dual exit and so are many aftermarket options. Some go to a single with no loss of power. It's up to your aesthetic preference, but single is hypothetically lighter.
As for putting multiple mufflers in series, the stock exhaust goes through three cats in sequence before splitting to the mufflers. Plenty of people also use resonators or presilencers even in performance exhausts. I see no reason you couldn't put two mufflers in series as long as they aren't restrictive on their own and are appropriately sized.
If you want something off-the-shelf and reasonably quiet, go for Racing Beat. All the other options I have heard (other than stock) are fairly loud.
Information Regurgitator
Joined: Feb 2001
Posts: 1,994
Likes: 208
From: Sparta TN. United States
Are you getting rid of the Flowmaster? IIRC they aren't recommended for rotaries. They have no packing to burn out but the rotaries exhaust pulses break the welds of the internal baffles over time. They're not cheap but you might look into the Borla X1-R. They have a straight thru style multi core. In theory it should knock the sound down more than a standard straight thru style without too much additional flow restriction. Keep your resonator and put it( Borla) in place of the flowmaster. Or try a RB presilencer in place of your resonator with the Borla. The RB universal ones aren't too bad.
Borla XR-1 Racing Mufflers | JEGS
borla xr1 inside - Google Search
Exhaust Universal Parts - 1986-92 Mazda RX-7 Performance Parts (racingbeat.com)
Borla XR-1 Racing Mufflers | JEGS
borla xr1 inside - Google Search
Exhaust Universal Parts - 1986-92 Mazda RX-7 Performance Parts (racingbeat.com)
Thread Starter
Junior Member
Joined: Sep 2020
Posts: 12
Likes: 0
From: chatham virginia
thanks I'll definitely check these options out the exhaust set up ive got now was a last minute thing because the exhaust it had before (duel glasspacks) was too loud and i got in trouble for it i didnt like it anyway but i wasn't quite in the position for a lot of options
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