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Engine, Exhaust, Transmission Discuss the FR-S | 86 | BRZ engine, exhaust and drivetrain.


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Old 08-14-2018, 11:00 PM   #15
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When you go catless, everyone behind you suffers. Don't be a selfish asshole. At least keep the secondary, please.
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Old 08-14-2018, 11:17 PM   #16
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I have an Ace header with the stock front pipe. I get a little bit of fuel smell on cold starts and after running the car hard but otherwise it's not noticeable. Just keep the stock front pipe. You sacrifice 10hp but you don't have to worry about a cheaper high-flow cat pipe breaking.
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Old 08-14-2018, 11:24 PM   #17
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Just keep the stock front pipe. You sacrifice 10hp but you don't have to worry about a cheaper high-flow cat pipe breaking.
You don't need an aftermarket frontpipe/cat for it to break

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Old 08-15-2018, 01:48 AM   #18
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But what about at rest? A smell on a cold start makes sense (and is fine), but I'm more curious if there will be a smell when I'm idling at traffic lights or similar.

You're over thinking this, keep stock front pipe and you'll be fine.
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Old 08-15-2018, 01:50 AM   #19
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You don't need an aftermarket frontpipe/cat for it to break

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He definitely messed with the tune in romraider and did the pops and bangs edit and messed something up, I've run e85 with a snap crackle pop tune for exhaust backfiring on overrun and have yet to see any damage to the cat after 40k miles.....
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Old 08-15-2018, 01:52 AM   #20
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Yeah that makes sense. I already bought an OFT a month or so ago with the intention of buying a header eventually. I'm fine with the smell while the second cat is warming up - as long as it doesn't get into the cabin after that I'm fine with it.

I think I'll get the Gruppe-S uncatted UEL header in that case then. $650 CAD for it vs $1200 for the JDL catted one I think is a no-brainer.

That's best, the gruppe-s is basically the tomei.

It won't get into the cabin unless you have an exhaust leak, I recommend buying grimmspeed gaskets and high temp RTV and it'll guarantee no leaks and long and you torque it down properly and to spec.
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Old 08-15-2018, 02:36 AM   #21
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He definitely messed with the tune in romraider and did the pops and bangs edit and messed something up, I've run e85 with a snap crackle pop tune for exhaust backfiring on overrun and have yet to see any damage to the cat after 40k miles.....
Do you do much track work? This one does I'm pretty sure. Not saying it is going to happen all the time but I've heard of similar things happening with cats in other non 86/BRZ vehicles. My point was doesn't matter if it's a aftermarket or OEM cat there can still be issues.

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Old 08-15-2018, 04:47 AM   #22
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I am completely catless(Gruppe-S, Fujitsubo FP), the smell is not noticeable unless the wind is blowing the exhaust back up to the front of the car when you're stopped, and or at a drive-through. If you can smell it while you're driving you have an exhaust leak into the cabin.
Which cat back? Could you post a video plz?
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Old 08-15-2018, 08:39 AM   #23
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Stock catback, it's too loud with my aftermarket catback on the car.
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Old 08-15-2018, 11:13 AM   #24
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That's best, the gruppe-s is basically the tomei.

It won't get into the cabin unless you have an exhaust leak, I recommend buying grimmspeed gaskets and high temp RTV and it'll guarantee no leaks and long and you torque it down properly and to spec.
Cool, thanks! I think I've made up my mind now - will go with the Gruppe-S with some decent gaskets.

Thanks everyone
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Old 08-15-2018, 12:05 PM   #25
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But what about at rest? A smell on a cold start makes sense (and is fine), but I'm more curious if there will be a smell when I'm idling at traffic lights or similar.
Not an issue. Leave the stock FP. You'll be fine
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Old 08-15-2018, 12:51 PM   #26
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Cool, thanks! I think I've made up my mind now - will go with the Gruppe-S with some decent gaskets.

Thanks everyone
The exhaust gaskets that come with the Gruppe-S header work fine, no need to spend extra money on different gaskets. I am going on over a year with no leaks, just make sure you torque everything down correctly when you install it.
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Old 08-15-2018, 01:22 PM   #27
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The exhaust gaskets that come with the Gruppe-S header work fine, no need to spend extra money on different gaskets. I am going on over a year with no leaks, just make sure you torque everything down correctly when you install it.
What's the torque spec on those bolts?
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Old 08-15-2018, 01:41 PM   #28
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Quote:
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What's the torque spec on those bolts?
I just used my impact gun(18 volt cordless) at a lower speed setting
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