displaying posts 1 to 6 of 6

Author Subject: Centre box cut out
Carl GTI

Newbie

Location: Bexleyheath

Registered: 11 Aug 2015

Posts: 43

Status: Offline

Post #1
So the middle box blew a massive hole right in the middle of the box - the gases directly hitting the underside of the car. I cut it out and welded a pipe section in its place. Now the exhaust note has a slightly deeper tone, but no increase in noise levels, at any rev range.
Very happy with the result. Probably saved a few grams in weight too.

Thought I'd post it up here in case anyone was deciding whether to do the same.
Posted 13th Jan 2019 at 17:41
gnrlee Forum Admin

Location: Leeds

Registered: 20 Aug 2005

Posts: 8,637

Status: Offline

Post #2
I've never blown a mid box before
Was always the Cat that gave out for me!

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Posted 13th Jan 2019 at 19:25
ale624

Regular

Location: bristol

Registered: 02 May 2016

Posts: 158

Status: Offline

Post #3
Interesting!
Posted 14th Jan 2019 at 00:39
miki4

Regular

Location: Cologne

Registered: 09 Nov 2015

Posts: 335

Status: Offline

Post #4
I thought the midbox would minimise resonances espacially at about 3000k rpm. Mine rattles af in that region as presumably the centre tube in the midbox broke and is loose now.
Posted 14th Jan 2019 at 07:52
armzsc6

Seasoned Pro

Location: Crowborough

Registered: 22 Mar 2008

Posts: 3,442

Status: Offline

Post #5
quote:
[quote="gnrlee"]I've never blown a mid box before
Was always the Cat that gave out for me!


What's a cat?

I've killed loads of centre boxes on cheaper systems like powerflow, magnex ones are always going.

The centre exit system I currently run sounded as raspy as a riced up civic with a fart can on the back when I first put it on.

Added the largest stainless centrebox I could find and it sounds much nicer now and noticibly quieter on long runs and idle.

Does have a decat and a supercharger though so very different.

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Posted 6th Mar 2019 at 13:55
cully

Seasoned Pro

Location: Cullompton

Registered: 12 Jun 2013

Posts: 1,084

Status: Offline

Post #6
i always used to blow the wadding out on track days on the centre box
had to go back to a std system to meet noise tests
Posted 6th Mar 2019 at 18:26

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