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Engine, Exhaust, Transmission Discuss the FR-S | 86 | BRZ engine, exhaust and drivetrain. |
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07-22-2018, 10:26 PM | #1 |
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UEL Header Rasp
So I just installed a set of JDL catless UEL headers to pair up with my Spec D (Invidia N1 replica) catback. After the headers were in, I immediately noticed way more rasp than it had with just the catback, it sounded like a tin can full of rocks was thrown into a paint mixer from 3.5-4.5k RPM. Took the silencers out of the mufflers and that helped a lot, but didn't entirely solve it. Stock overpipe and frontpipe. Anyone know the easiest way to get rid of rasp? I want to keep the mufflers if I can, so I was considering having a muffler shop cut the stock midpipe to size and weld a flange on so it'll fit the Y-pipe and mufflers. If I have to get rid of the mufflers too, does anyone know if the Invidia Q300 ones fit on an N1 Y-pipe? Thanks yall.
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07-22-2018, 10:37 PM | #2 | |
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07-22-2018, 11:31 PM | #3 | |
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You sure it's not an exhaust leak? tin can full of rocks isn't what I'd describe as rasp
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07-23-2018, 11:44 AM | #4 |
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You need a new catback. the n1 (or in your case the spec d) is known to sound raspy paired with a uel header. i had rhe same setup before and sounded like shit
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07-23-2018, 07:40 PM | #5 | |
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I've heard some sound clips of the N1 with JDL UELs and they sound way better than what I got right now (or maybe because all those guys have overpipes and front pipes). Maybe Spec D cheaped out on the resonator badly, but I'll also look for leaks as mentioned above. |
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07-23-2018, 07:59 PM | #6 | |
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07-23-2018, 08:00 PM | #7 |
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After going catless the 3.5-4.5k rpm range on our cars is known to be prone to rasp. Honestly the easier way to get rid of rasp would probably be to get a new catback.
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07-23-2018, 08:08 PM | #8 |
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Just do what I did and copper RTV everything!! lol My exhaust leak was driving me crazy.
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07-23-2018, 09:07 PM | #9 |
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As far as catbacks go, I was looking into a genuine Invidia system, probably a Q300. I'm gonna try and get the stock midpipe to fit since that resonator is way bigger, a shop should be able to fit it for real cheap. I'd rather not spend $600 on a new catback if I can avoid it.
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07-23-2018, 10:51 PM | #10 | ||
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what @Lakitu said, I used grimmspeed gaskets and high temp rtv on everything even the axleback to midpipe connection, and my leaks ceased. Some of the headers and exhausts may not have mating points that are perfectly decked flat and can cause a leak. Also you won't get a CEL from an exhaust leak if you are tuned or have done a O2 spacer cheat.
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07-23-2018, 11:17 PM | #11 | |
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Side note, JDL says they cut their flanges with a water cutter. When the part arrived, I noticed a slight bit of rust and the flanges were not so smooth. Exhaust leak is starting to sound more like the problem. |
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07-23-2018, 11:36 PM | #12 | |
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I spread mine all around the gasket in a thick bead, I suggest doing this on the grimmspeed ones. Make sure the bolts are torqued down properly when you do this as the rtv should essentially squeeze out. Also don't start the car till the rtv has cured properly if you can, it take an hour or 2 to become "gasket like". I'd make sure you do the header to engine block gaskets as well.
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07-24-2018, 03:52 PM | #13 |
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if you want an invidia catback, id suggest R400, or for even lower volume the Q300
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07-24-2018, 04:46 PM | #14 |
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Can confirm the r400 is a good exhaust, but they like to break hangers so be aware of that. I switched to a Tanabe Concept G and I like that more betterer.
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