Ace A350 exhaust manifold clearance fix - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

mkodama · 01-31-2022, 01:50 AM

It’s a great header BUT annoyingly it sticks a little low by about 1/8” or 3mm, contacting the aluminum panel and making the car sound and feel like it lost a cylinder. Here are the two magical places on this panel to either flatten with a hammer(they are raised reinforcement ribs) or potentially drill with a 1” hole saw. Notice contact points circled with a marker in the pictures.

EDIT 13APR2022: Also flatten area circled in red.

CSG Mike · 01-31-2022, 07:29 PM

Yup, they maximize every bit of space available.

This can also be addressed with stiffer engine mounts, which is why the STi mounts are recommended.

MrSkubi · 02-01-2022, 03:06 AM

Good info but for me this issue was far worse. Not sure if I got lemon header or what but it still made contact in sharp left-handers even with with fresh STI mounts and a lot of hammering done to it. In provided example it's touching for me it was more like rubbing through

Now I'm about to install Beatrush under panel and hope for best.

01-31-2022, 01:50 AM	#1
mkodama 86Drive Challenge Join Date: Dec 2016 Drives: 2017 BRZ PP Location: Menlo Park, CA Posts: 104 Thanks: 31 Thanked 65 Times in 40 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Ace A350 exhaust manifold clearance fix It’s a great header BUT annoyingly it sticks a little low by about 1/8” or 3mm, contacting the aluminum panel and making the car sound and feel like it lost a cylinder. Here are the two magical places on this panel to either flatten with a hammer(they are raised reinforcement ribs) or potentially drill with a 1” hole saw. Notice contact points circled with a marker in the pictures. EDIT 13APR2022: Also flatten area circled in red. Attached Images Last edited by mkodama; 04-14-2022 at 02:32 AM.

02-01-2022, 03:06 AM	#3
MrSkubi Senior Member Join Date: Nov 2017 Drives: 17 BRZ ,21 GR Yaris, 23 GR86 Location: Poland Posts: 150 Thanks: 395 Thanked 134 Times in 77 Posts Mentioned: 1 Post(s) Tagged: 0 Thread(s)	Good info but for me this issue was far worse. Not sure if I got lemon header or what but it still made contact in sharp left-handers even with with fresh STI mounts and a lot of hammering done to it. In provided example it's touching for me it was more like rubbing through Now I'm about to install Beatrush under panel and hope for best. Last edited by MrSkubi; 02-02-2022 at 08:14 AM.

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01-31-2022, 07:29 PM	#2
CSG Mike Join Date: Jul 2012 Drives: S2000 CR Location: Orange County Posts: 14,530 Thanks: 8,918 Thanked 14,175 Times in 6,834 Posts Mentioned: 966 Post(s) Tagged: 14 Thread(s)	Yup, they maximize every bit of space available. This can also be addressed with stiffer engine mounts, which is why the STi mounts are recommended.

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