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The mkiv Supra Owners Club

New exhaust back box or entire system?


CGEX

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Hey guys just wanted a little info really

 

I have a 94 N/A auto and wanted it to sound a little meaner, I was going to install a new stainless exhaust system, but other things take priority (being a responsible adult is crap), anyway is it worth me just installing a bigger back box (muffler) to make it sound better? I know it's cheaper but will it mess up the way the car performs or anything ?

 

As far as I can see the exhaust system on it at the moment is stock, but it is in brilliant condition.

 

Will appreciate any feedback you guys have.

 

Thanks

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If you're on a budget and are "handy" or have a mate who is, the best mod is to cut out the 2 front boxes and weld in open pipes.

 

In my opinion, this sounds the best too.

 

3" pipe with a large tip makes an N/A sound like a flat old fart.

 

There was an already modded one in the for sale section a while ago, have a search, it may still be lurking?

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For a budget I'm not looking on spending thousands and although I'm not handy I know someone who is, I mean the car sounds good stock but I've always liked those nice wide backboxes that stick slightly to an angle, although I'm guessing they are usually attached to a new mid pipe as well. I don't want to mess around too much with decatting it as I know I'll never find a place to MOT it.

 

Would I be able to adapt the mid pipe to accommodate a wider exhaust? I think the stock system is 2"? So would it be possible to make or buy an adapter to fit other wider exhausts?

 

Cheers for your quick replies guys !

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I don't want to mess around too much with decatting it as I know I'll never find a place to MOT it.

 

A 1994 NA in good working order should easily pass the MOT without any cats fitted. If you follow the flow chart below, there is no "exact match in the analyser database" for your car (all UK Supras were TT's with the 2JZGTE engine) so it would be subject to a non-CAT emissions test.

 

http://imageshack.us/a/img560/9263/picture1nq.jpg

 

Would I be able to adapt the mid pipe to accommodate a wider exhaust? I think the stock system is 2"? So would it be possible to make or buy an adapter to fit other wider exhausts?

 

You could fit a bigger diameter cat back exhaust, the tubing may be wider but the flange where it bolts up to the 2nd cat is the same. For the best results, I'd fit an exhaust that has been specifically designed for an NA, these are usually 2.5" diameter with a silencer on the mid pipe and a back box.

 

Speak to Paul at Whifbitz about what they can supply http://www.garagewhifbitz.co.uk/toyota/supra/exhausts-decats.html or perhaps contact your local Powerflow dealer http://www.powerflowexhausts.co.uk and price up one of their systems.

Edited by Nic (see edit history)
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I was under the understanding you will still need a cat due the 2JZ-GTE being in the database (since it came in the UK car), its only the 2JZ-GE that isn't in the database.

 

So how do people with TTs end up with aftermarket exhaust systems?? Friendly MOT tester? Or leave a cat in?

 

I would like to get rid of my stock exhaust :)

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So how do people with TTs end up with aftermarket exhaust systems?? Friendly MOT tester? Or leave a cat in?

 

I would like to get rid of my stock exhaust :)

 

Alot of people have friendly testers, i just normally leave the 2nd cat in the boot and tell them to fit it if they need to...... In fact my 2nd cat is still in the packaging it came in when i bought it 3 years ago lol

 

ps i have an exhaust for you ;) ready to go lol. Just need it gone asap as its taking up room! http://www.mkivsupra.net/vbb/showthread.php?326313-XXR-531-wheels-and-whifbitz-exhaust

Edited by drift_bear (see edit history)
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Alot of people have friendly testers, i just normally leave the 2nd cat in the boot and tell them to fit it if they need to...... In fact my 2nd cat is still in the packaging it came in when i bought it 3 years ago lol

 

ps i have an exhaust for you ;) ready to go lol. Just need it gone asap as its taking up room! http://www.mkivsupra.net/vbb/showthread.php?326313-XXR-531-wheels-and-whifbitz-exhaust

 

As much as I would love to take that off your hands, I cant really afford it at the moment! The questions are more for the future :) Thanks!

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