Help with TOMEI exhaust hole bumper cove install - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

DoM1n2c · 01-19-2023, 02:05 PM

i swapped my exhaust to a single exit and bought the right side carbon fiber exhaust cover, from tomei, in the instructions it states to use a 4.2mm drill bit and center drill to make my holes except I'm confused on what size center drill to use and if a center drill works like a normal drill bit or not, any insight or tips would be helpful as I don't want to destroy my bumper with bad holes.

norcalpb · 01-19-2023, 07:38 PM

Never heard of a center drill bit I’ve heard of a center punch.

Essentially you take these 2 tools and make an indent where you want to drill. That way the drill won’t walk on you.

x808drifter · 01-20-2023, 04:42 AM

Quote:

Originally Posted by norcalpb

Never heard of a center drill bit I’ve heard of a center punch.

Essentially you take these 2 tools and make an indent where you want to drill. That way the drill won’t walk on you.

It's basically a small drill bit and a larger countersink bit in one.

01-19-2023, 02:05 PM	#1
DoM1n2c Junior Member Join Date: Jan 2023 Drives: red subaru brz Location: massachussetts Posts: 1 Thanks: 0 Thanked 0 Times in 0 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Help with TOMEI exhaust hole bumper cove install i swapped my exhaust to a single exit and bought the right side carbon fiber exhaust cover, from tomei, in the instructions it states to use a 4.2mm drill bit and center drill to make my holes except I'm confused on what size center drill to use and if a center drill works like a normal drill bit or not, any insight or tips would be helpful as I don't want to destroy my bumper with bad holes.

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01-19-2023, 07:38 PM	#2
norcalpb Senior Member Join Date: Oct 2013 Drives: 2013 BRZ, 2023 Model 3 Location: SF Bay Area Posts: 2,296 Thanks: 1,212 Thanked 861 Times in 570 Posts Mentioned: 15 Post(s) Tagged: 0 Thread(s)	Never heard of a center drill bit I’ve heard of a center punch. Essentially you take these 2 tools and make an indent where you want to drill. That way the drill won’t walk on you.

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