displaying posts 1 to 6 of 6

Author Subject: Centre box cut out
Carl GTI

Junior User

Location: Tripoding at Brands Hatch

Registered: 11 Aug 2015

Posts: 82

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 Owner

Location: Leeds

Registered: 20 Aug 2005

Posts: 8,865

Status: Offline

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


Proud Member of the ASTOR Owners Club
Posted 13th Jan 2019 at 19:25


Location: bristol

Registered: 02 May 2016

Posts: 173

Status: Offline

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


Location: Cologne

Registered: 09 Nov 2015

Posts: 390

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

Seasoned Pro

Location: Crowborough

Registered: 22 Mar 2008

Posts: 3,445

Status: Offline

Post #5
[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.


Black power baby! SUUUUUPERCHARGED Superman
Seat Leon FR TDI 190BHP 300lbft daily gti-6 killer :p
12x 306's owned so far

Cambelts, clutches, service work carried out on All makes and models, Peugeot Citroen / mitsubishi specialist.
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Posted 6th Mar 2019 at 13:55

Seasoned Pro

Location: Cullompton

Registered: 12 Jun 2013

Posts: 1,093

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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