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The mkiv Supra Owners Club

standerd cat remving insides


D8MOA
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hay well my supra is up and running, went for a drive today but dosnt seem very fast to me ( i do also ride a gsxr1000) i havnt got the funds ATM to buy a decat, if i remove the inside of my cat will i get the same sort of power gains as a decat? or is this really the wrong way to go

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I've gone down this route before, and to be honest I gave up after hours of drilling, chiseling etc (someone even recommended spraying it with brake cleaner but that didn't work either). If you're considering this then make sure you have a breath mask - the dust that comes out the inside is very nasty. I didn't open up the cat, simply got at it from the ends (1st cat).

 

And even if you do succeed, you'll probably need to weld a pipe through the middle anyway to ensure a good enough airflow. Overall the idea was a right PITA to carry out and not worth the time and effort.

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What do people think about a replaceable cat/decat, held on by clamps at each side so that you have a decat pipe most of the time, but come MOT time you take out the straight through pipe section by undoing the two V-band clamps and slot the cat in, then snap the clamps shut to hold it in place????

 

Would take about 5 mins and not need any tools, gaskets or exhaust paste.

 

Clamp is like this:

lever_vband.jpg

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What do people think about a replaceable cat/decat, held on by clamps at each side so that you have a decat pipe most of the time, but come MOT time you take out the straight through pipe section by undoing the two V-band clamps and slot the cat in, then snap the clamps shut to hold it in place????

 

Would take about 5 mins and not need any tools, gaskets or exhaust paste.

 

Clamp is like this:

 

I was thinking about something similar the other day - be a good idea and handy, though the cost of a suitable replacement / temporary cat might make it unfeasible

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Bob, you could use the original cat & pipework. Cost would be:

 

6 Flanges at £15 each approx

2 clamps at £20 each approx

Piece of stainless pipe same length as cat £10 approx

Fabrication £60 approx

 

Say £200 max.

 

Probably could get it done for less, but that's a maximum estimate.

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What do people think about a replaceable cat/decat, held on by clamps at each side so that you have a decat pipe most of the time, but come MOT time you take out the straight through pipe section by undoing the two V-band clamps and slot the cat in, then snap the clamps shut to hold it in place????

 

Would take about 5 mins and not need any tools, gaskets or exhaust paste.

 

Clamp is like this:

 

Why bother though, changing the 2nd cat only takes 10 minutes and is enough to pass an MOT.

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