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MG MGF Technical - Silenced Cat By-Pass

Are these really any quieter that the normal by-pass tube? Until the exhaust gets to the back box the exhaust (with the exception of the cat) is simply pipe work - no silencer.

So I don't understand how or why a silenced Cat By-Pass is any better than an a by-pass tube.

Steve Ratledge

dont bother with them mate.. just an headache when it comes to m.o.t time. dont inhance performance a great deal. stick with the cat..
alex

And conversely, yeah go for it mate
get that cat off.

It makes a huge difference the the sound and character of the engine. It's not a very big job at MOT time. I can do mine in 5 mins and without even jacking the car up!

Neil

Saw a silenced bypass for sale at Stoneleigh. MotBuild (I think) said it was mainly for Elises with small exhaust boxes which needed to pass track day noise regulations. I mean, no-one would fit a 90 decibel exhaust to an F, would they, eh Neil?
Pete Davey

96 mate

;-)

yeah in that case a good idea actually!

Neil

I have a straight cat by-pass pipe now. With the Miltex it is Bl*dy loud - the wife would not get in the car and that was before the new cams.

What I wanted to know was does a silenced Cat By-Pass actually make it quieter than the straight cat by-pass pipe or it it just tosh.
Steve Ratledge

Steve

In answer to your question 'Yes' it does make it quieter, I got a silenced de-cat with my Blue Flame exhaust, took it off after a week as it was too quiet and silenced the new exhaust to pretty much the same level as standard, unless you really put your foot down.
Thanks
Arron
Arron

This thread was discussed between 18/02/2006 and 21/02/2006

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