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Ever seen inside a Prodrive backbox? Take a look...

Old 18 September 2014, 11:04 PM
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JayUK91
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Default Ever seen inside a Prodrive backbox? Take a look...

A little backstory. This is the original Prodrive exhaust recently removed from my Blob STi PPP. Upon taking the exhaust off the car, and cleaning it up a little, I was greeted with this:





A nice big hole and an attempt to cover it up!

So being the inquisitive fella I am, I had to take the plate off and take a peek inside (after stripping every screw head and resorting to blunt force):







Just a single, perforated pipe.

Now I'm not a technical guy, but I can only assume that perhaps there was once a packing material in here to help muffle the sound?

So this got me thinking. For a bit of fun, now that there's a gaping hole in my spare backbox, is there any way I can try to alter the sound?

Just a couple of ideas:
  • Sleeve the perforated inner pipe with a sheet of aluminium, clamp it on and effectively have a 'straight through' backbox?
  • Tightly pack the chamber with material and have a makeshift 'Glasspack' exhaust?
Would this make any difference at all? I'm thinking not much - but is it something worth trying?
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Old 18 September 2014, 11:10 PM
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XDevil666
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Buy some exaust turbo whistles and put a few in there, would be good to see how it sounds lol

http://m.ebay.co.uk/itm/131103369294?nav=SEARCH
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Old 18 September 2014, 11:41 PM
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Hmmm, interesting, wouldn't bother with straight threw.

If you covered up some of the holes may give a deeper sound
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Old 19 September 2014, 06:27 AM
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I think that box has been cut open and had the sound deadening removed. So no a true likeness of the inside of a prodrive box.
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Old 19 September 2014, 09:27 AM
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Wadding
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Old 19 September 2014, 10:21 AM
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Originally Posted by XDevil666 View Post
Buy some exaust turbo whistles and put a few in there, would be good to see how it sounds lol

http://m.ebay.co.uk/itm/131103369294?nav=SEARCH
Oh god, I don't think I could bring myself to do it.

Originally Posted by jaygsi View Post
Hmmm, interesting, wouldn't bother with straight threw.

If you covered up some of the holes may give a deeper sound
Is that a fact? I'm trying to visualise how the muffler chamber alters the sound but I'm clueless.

Originally Posted by Turbotits View Post
I think that box has been cut open and had the sound deadening removed. So no a true likeness of the inside of a prodrive box.
I bought and fitted a TSL Group N backbox to my car to replace this, but at the moment I'm a little disappointed with it. This is more than likely because this Prodrive exhaust was already louder than it was supposed to be with the wadding material removed.
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Old 19 September 2014, 10:59 AM
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That is proper pikey lol
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Old 19 September 2014, 11:40 AM
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Originally Posted by 53 View Post
That is proper pikey lol
Tell me about it, I was gutted when I took it off the car - was hoping to sell it on, but no chance of that!
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Old 19 September 2014, 12:14 PM
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Oh dear! that is a gash job.
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