Thinking about keeping stock exhaust. - Page 2 - Miata Turbo Forum - Boost cars, acquire cats.

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Old 10-09-2007, 12:23 PM   #21
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Ditch the stock exhaust... it's like putting a banana up the damn tail pipe.

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Old 10-09-2007, 06:53 PM   #22
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I used my stock exhaust for a while, car performs much better with my 2.5" diy rig, but stock was tolerable to keep things as simple as possible when installing my turbo.

I followed the begi install directions to a t and eventually the DP put so much pressure on the exhaust that it cracked at the cat flange.

Before the exhaust cracked the car was freaky quiet. Like some kind of luxury car or something.
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Old 10-09-2007, 11:02 PM   #23
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im running a turbo soon i got a magnaflow highflow cat and a borla cat back, should i get a straight through or keep the high flow?
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Old 10-10-2007, 12:28 AM   #24
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I ran around with my stock exhaust on for a while, no big deal. A lot of power was left on the table, but it was nice to get the car up and running quickly. It was also ridiculously quiet, like silent. Now I have a 2.5" system with a highflow cat and $25 flowtech muffler. Unless someone can back it up with some proof, I don't believe a 2.5" cat is going to be a bottleneck in a <250 hp car.
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Old 10-10-2007, 09:18 AM   #25
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If I decide to make my own exhaust will I have to tell begi to use a bigger flange on the downpipe or it doesnt matter?

Im guessing they use a smaller flange otherwise to mate to the stock exhaust, id just like to clerify this.
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Old 10-10-2007, 09:19 AM   #26
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Quote:
Originally Posted by Saml01 View Post
If I decide to make my own exhaust will I have to tell begi to use a bigger flange on the downpipe or it doesnt matter?

Im guessing they use a smaller flange otherwise to mate to the stock exhaust, id just like to clerify this.
Sounds like BEGi are the people to talk to about this one.
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Old 10-10-2007, 09:23 AM   #27
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Quote:
Originally Posted by mschlang View Post
I ran around with my stock exhaust on for a while, no big deal. A lot of power was left on the table, but it was nice to get the car up and running quickly. It was also ridiculously quiet, like silent. Now I have a 2.5" system with a highflow cat and $25 flowtech muffler. Unless someone can back it up with some proof, I don't believe a 2.5" cat is going to be a bottleneck in a <250 hp car.
My cat cost about 10 whp in a 250 whp car, and a little response too. Partly due to the fact I can't hold boost up to redline. Used to hit 13 psi, now it's more like 11. I'm a sad panda.
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Old 10-10-2007, 03:22 PM   #28
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I'm a sad panda.
At least you aren't a Trueno Panda.
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Old 10-10-2007, 04:08 PM   #29
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Ben, that wastegate solution I was telling you about has been working great. However, I was not able to source you an extra actuator. Bolts right in, just needed to be lengthened.
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Old 10-10-2007, 04:22 PM   #30
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Kindly remind me what the actuator was from.
Ben's going to look through his pile o turbo parts for a spare 16G actuator.
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Old 10-10-2007, 04:30 PM   #31
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off a 300zx t25 iirc.


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Old 10-11-2007, 01:35 AM   #32
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There is a cheap one they are talking about on m.net
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