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MG MGB Technical - Fitting bomb box (centre exhaust box)

Hi all

Hope someone can help! We own a 1976 MGBGT (r/b) with a standard stainless exhaust system with standard centre and rear boxes. I really wanted to change the sound of the car and had heard bomb boxes on other B's and loved the sound. Got hold of a stainless bomb box to fit on the existing system however, it appears to be shorter in length than the current centre box? I will try to explain as best I can - The center box is connected back and front to the pipes with shorter lengths of pipe welded to it, something the bomb box doesn't have. Hence, if I remove the centre box, I will have a gap each side with nothing to attach to the bomb box! What would I need to fill the gap? Or is it better to replace the whole system? I have heard mention of stepdown pipes (no idea what they are or where to source them???) Does anyone have any superior knowledge of exhaust systems that can help me (won't take much as I have none whatsoever!)

regards

Martin.
Martin Clegg

If there is a gap, it could be a chrome bumper part. Moss did this to me and I spent two days trying to make it fit.

But even with the correct part I had to source an oversize sleeve to connect the system.

IMHO a one box system sounds best, mine emits 97db at 4500 rpm
c cummins

Martin,


By a bomb box, do you mean a glasspack. If yes there is many Cie offering diff. lenght.

Two of them:

http://www.thrushexhaust.com/products.html

or

http://www.heartthrobexhaust.com/glasspacks&flowpacks.html


Cheers,

J.G.C.
Jean Guy Catford

Martin
Look in the yellow pages for stainless exhaust makers near you(loads popping up now)
Get them to either weld on an extention to your bomb box or get them to make a link pipe which is a short piece of pipe that will bridge the gap.

Ste
Ste Brown

Martin I have a similar "Glass-pack" front silencer on my car instead of the resonator because it resonated too much. My local exhaust shop had no problem extending the pipe and expanding the pipe to fit the new "bomb" as you call it. I haven't noticed much difference in the noise level in fact it could be quieter with the new system.

Andy
Andrew Preston

AS has been said, your local muffler suppliers will have no trouble in adapting the box. My only criticism of my man at the shop is that he welded every part on now I can only drop the whole system. Ah well that is another project for another time. to re-design the system but make it dismantle. Incidentally, Borla satiness steel exhaust systems make the very best clamp/bracket to join tubes with, and this was the exhaust man that admited this on seeing a system that was fitted to my Hyundai Tiburon ( may every-day car.) Mike
J.M. Doust

In fact as OE the exhaust system was welded together after the clamp to the cast iron manifold it was all one piece. I always believed this to be to keep it one piece when it struck obstructions due the tiny clearance under the centre box. Well working for the one year under warranty anyway.
Stan Best

This thread was discussed between 02/08/2011 and 09/08/2011

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