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Engine, Exhaust, Transmission Discuss the FR-S | 86 | BRZ engine, exhaust and drivetrain. |
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01-25-2013, 06:49 PM | #15 |
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From what others have shared with me on the forums with concerns about size on exhaust:
2.5" is sufficient upwards of 350-400 whp. 3" past that from people testing high HP turbos. I don't know about you, but I don't plan on reaching that much HP anytime soon. I think 2.5" will be plenty sufficient for probably 95% of drivers. |
01-25-2013, 08:27 PM | #16 |
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Yea unless you're going for massive hp the gains won't be that significant beyond 2.5". I'm waiting a while until i turbo to replace my exhaust, hopefully there will be more options for custom setups by then. Looking for a 3" dump pipe and front pipe into a tapered 3-2.5" midpipe. From what i've heard having the larger diameter also helps reduce egt due to better heat dissipation properties of the larger diameter.
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01-25-2013, 08:54 PM | #17 |
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Might have to get a custom mid pipe made bc I would like to keep the look... I'll be back under tomorrow to see what I can do
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03-11-2018, 11:49 PM | #18 | |
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Quote:
My car came with a TRD cat back and I'm installing my new nameless front pipe. About 1 3/4" ID..... Way under 2"...... even the OD is under 2"... My new nameless front pipe is 2 1/4" ID so 3/4" larger...... May be why top end doesn't seam to get better... My header add lots of mid range but didn't seam to add much top end, I think because of the restrictive stock and trd exhaust.. I'll be getting a new cat back...
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The Following User Says Thank You to shr133 For This Useful Post: | roddy (03-14-2018) |
03-14-2018, 03:27 PM | #19 |
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made some more accurate measurements...
The TRD cat back has a muffler and a resonator. After the resonator is good 57mm 2 1/4 pipe OD, not bad. The bad part is before the resonator 51mm 2" OD pipe with a flange ID inside the pipe of only 45mm 1 3/4". So don't think I would buy this cat back, too many better options for less....
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03-14-2018, 07:40 PM | #20 | |
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Quote:
Because I was getting some drone from my TRD at certain speeds, I considered having a muffler shop splice the stock mid-pipe from the front flange through the stock resonator to the rest of the midpipe of the TRD. That way I would have a quieter resonator and larger mid-pipe combined with the cool TRD muffler. In the end, after nearly three years of use, I sold my TRD intake and exhaust and put the stock back on with a K&N air filter insert. Much quieter and still runs well. Doug |
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03-14-2018, 09:03 PM | #21 |
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@shr133 is right. I compared the TRD, stock, and Magnaflow cat-backs a few years ago, with pics (it is around the site somewhere). The TRD is considerably SMALLER than stock from the cat pipe to the muffler.
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03-14-2018, 09:23 PM | #22 |
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are you guys talking about the TRD RS1.0 exhaust with the quad tip, or the D tip??
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03-14-2018, 11:32 PM | #23 | |
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Quote:
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03-15-2018, 07:29 AM | #24 | |
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Quote:
D tip.
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04-10-2018, 08:18 PM | #25 |
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I switched to the speed factory V1 and nameless front pipe with 200 cell cat.
At cruise it is quieter than the TRD with the stock cat and resonator, but is louder over 2800rpm but, not crazy...
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Enkei TS9 18 X 8, Michelin Sport 4S 225 40 18, Flex Fuel, Edelbrock Supercharger, P & L header, Nameless front pipe, V1 cat back, Aluminum Driveshaft, pvc delete, med duck bill, KW V3, Whiteline 20 and 18 mm bars, Buddy Club and SPL control arms, Toe Arms, motor and trans mounts, Whiteline bushings, SHR stage II tune.
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