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Discussion Starter · #1 ·
Thinking about this upgrade next.
I currently have a JT full system and have a few questions if any of the knowledgeable members are around
Are they legal for day to day use on a 1997 car?
Is there a 3" pipe available? I know Abbott do one but its 2.5"
Where will I see the benefits of a bypass pipe?
Is it noisier?
Does it affect fuel consumption?
Is it an easy change for MOT time?
Thanks all,
Andy
 

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The cat is only there to control emissions - it is not actually a requirement of the MoT that you have a cat.

However, you will probably find that your care will fail the MoT emissions test without the cat.
 

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Where will I see the benefits of a bypass pipe?
- A bit more top emnd power and reduced spool up times

Is it noisier?
- yes, if it's a straight bypass as the cat also has some silencing properties

Does it affect fuel consumption?
- under like for like conditions, probably a slight improvment. However, as you will want to use your right foot more, fuel consumption might go up


Is it an easy change for MOT time?
- not that straightforward; the bolts around the turbo outlet are hard to get at, and there's also a support bolted to the engine block IIRC. It would take you about 45 minutes to an hour I guess, and you'll need axle stands. Your garage might do it for you though, and it will take them less time. The earlier mid section cat models are a lot simpler.

HTH
 
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