Borla dual exhaust on miata





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Published on Jul 24, 2007

Borla dual exhaust system, sport version. This is my '91 miata with Racing Beat high flow intake with Jackson Racing performance headers and high flow cat.

Comments • 53

ryan simmons
Is this a dual muffler setup coming out of a Y pipe, or is this the Borla dual tip single inlet exhaust? I can only find the sport version for the NB miatas. Did you fit up an NB exhaust on your NA? Do you possibly have a link to the setup you bought? I've been looking for something similar for quite a while.
Russkiy Fox
+heathmeador , they use the 1.6l B6ZE 4 cyl
David Pickles
Is that legal sounds very loud
I don't, haha. I could make a small brace for it I guess.
Sebastian Arrazola
how do you get the left exhaust tip to stop shaking when you rev? 
Getting a cold air intake won't change the sound of the exhaust at all and doesn't force air into anything. It will however give you more sound from the engine and allow the engine to breathe easier which allows for increased power which unfortunately isn't much in our cars. You'll just get exhaust noise and intake noise so maybe the noise of the intake will help you notice the exhaust less but it will all still be loud most likely. Exhausts that flow more freely are typically louder by nature.
Nick Cascioli
The only problem is when the top was up it was really bad. Borla sent me a venturi which solved a bit of the problem. I did a before and after decibel reading and noticed a drop of about 3 decibels across the rev range. But the noise is still at a level that is annoying. I'm just hopping that the Jackson Racing intake I get forces enough air through the resonator to lessen the droning. Otherwise I'm thinking about going to Meineke to have them make me a connecting pipe with a smaller diameter. 
Mine does it a bit too but it's not all that bad if you have a hard top or even the soft top up. On really long drives it does make my ears ring a bit once I reach my destination and even more so with the top down. It also depends on how fast you're going whether it's 55 or 80 there can be a big difference in sound output. It's just something you get used to for the most part. On really long drives/long distance travel I recommend ear plugs.
Nick Cascioli
I now have a very similar setup on my 1994. It has Racing Beat Headers, Flyin' Miata High Flow Catalytic Converter, and the Borla Dual Exhaust System. What I've noticed is that it drones badly on the highway. Have you or anyone else experienced this problem? And would something like a cold air intake solve the problem by forcing more air through the system? 
@Aaradarn It was relatively easy. The hard part was getting the old exhaust off. It did not come with O2 sensors but it does have a plug on it if you need to install one. My car is a '91 so it doesn't have an O2 sensor that far back on it to need to use the plug. Leveling the left side I simply loosened the collar that holds the pipe in place and adjusted it, then tightened it back.
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