I have a ‘90 Mazda MX-5 Miata. I‘m looking at buying either a Magnaflow or Borla cat-back exhaust system. Basically, I want to know which brand is considered better. Looking for deeper, louder, and more throatier sound, and also better HP increase. I‘ve seen videos of the Magnaflow exhaust on YouTube, but couldn‘t find any on Borla.
First, get a new header and cat! The closer the changes are made to the engine the better the results. Also most of the original headers crack and need replaced. This throws off the readings of the O2 sensor (runs rich) and results in clogging the cat. Next replace the cat, use a hi-flow one like a Mega flow. From there on back sound is not my concern, if it is yours then check you-tube for sound bites. True some of the clips there have poor sound quality. But it should help you if sound is your only objective. Me, I am after performance! So I shopped for a 2.25 inch system. The reason being that as the exhaust pipe gets larger, low end performance drops off. Go to big and then you have to stay high in the RPM range to get the benefit. But the ideal cruising RPM is about 3 grand and not many drivers operate in the 6 grand or more range. I know of Miata drivers who shift at 6 grand tops, so if you don't plan on high revs stay under 2.5. Right now Blue gets 34 MPG average, it has a Race Beat Header, Mega Flow Cat and a Monza exhaust. The Monza exhaust sounds more like the old sports cars, is carbon steel and a lot cheaper then either of those you are considering. My point is do the headers and cat first! That is where the biggest return on the investment can be made!
two types of auto matic trans in the 70's either 350 or 400 3 speed's no over drive trans yet.
Borla is a very good product, but if your looking for horses then take off your heads aND HAVE THEM DO A PORT AND POLISH JOB ON THEM, GET A BIGGER
You can't go wrong you know. Always go with Magnaflow! The best exhaust system in the world.,,,,,,,
The tranny should have the serial numbers stamped on it. Borg Warner is one of the top transmission mfgs. t10 is the top of the line. GM always has its stamp on it at the top or side of the casing.
