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Catalytic Convertor By-Pass Pipe, Stainless Steel, MX5 Mk1

Now supplied as a silenced bypass pipe, in 100% polished 304 Stainless Steel, complete with all fixing bolts and gaskets.

100% Stainless steel catalytic convertor by-pass pipe (cat replacement pipe). For the removal of the catalytic convertor from the exhaust system.

Fits all Mk1 models with the following lengths of catalytic convertor, 1989>1996

There are three different cats fitted to the Mk1,
1.6 or 1.8 up to 1994. This cat is 370mm in length.
1.6 or 1.8 from 1994 to 1996. This cat is 440mm in length.
1.6 or 1.8 1996/8. This cat is 475mm in length. A cat replacement pipe is NOT available for this model.

The safest way to ensure you order the correct pipe is to measure the distance between the two mounting flanges of your existing cat.

Supplied complete with gaskets and bolts.

Please Note: As from January 1st 2012, the UK MOT laws changed regarding catalytic convertors. Any vehicle built after 1992, MUST have a catalytic convertor fitted regardless of whether or not it passes an emissions test. Any car presented without a cat fitted will fail. We would advise checking with your MOT tester before fitting this pipe if the car is being used on the road.

Even though this is a 'silenced' bypass pipe, the removal of the catalytic convertor WILL result in an increase in exhaust noise! Some like it, others do not. Beware!


Based on 44 reviews

Richard Ellis
Looks so nice I wish I could put it somewhere in view. Great quality and easy to fit. Fitted with new exhaust helps produce a lovely throaty sound that some may feel a tad loud.
04/04/2023 12:17:08
Paul Dyson
Top quality product and great service and advice.
13/11/2020 12:16:04
Jason Wood
A well made product from MX5Parts with the correct gaskets, bolts and nuts.
03/08/2020 12:16:05
paul armstrong
It is very well-made and fits perfectly ..I have the mx5 parts cat back single exit already fitted which is also nice...the pair combined make for a nice exhaust tone with popping on the down shift…I do not know if you get much more power but on my 94 1.8 Eunos it feels it…recommended
04/06/2020 12:16:05
David Kenway
Very pleased with this product. A perfect fit and a much improved exhaust note, not intrusive but throaty and far easier revving in the mid range. Local exhaust place fitted for £40 as the nuts had to be heated to loosen. Remains to see what MOT has to say about it but I have the original cat to bolt back on if required for MOT. A superb product and super fast delivery as usual.
28/03/2017 12:16:15
Fraser Prstana
Lovely decat! Makes my Eunos far louder and more throaty. Very easy to install and fits perfectly. Also, it feels faster in mid-range performance!
08/07/2016 12:16:17
Les plus : kit complet, aspect général flatteur et prix. Le moins : j'en suis à mon deuxième, le premier s'étant découpé comme une boîte de conserve tout autour de la soudure ! Un produit à améliorer...
29/12/2015 12:16:18
Adrian Jordan
As ever, perfect service. Looked lovely - fitted no bother.Sounds lovely, a light "chuffing" at low revs, growing to a rasp in the midrange, topped off by nastiness at full chat. Marry this to a 4:2:1 stainless manifold and a twin-exit silencer...pure filth really :).
14/05/2015 12:16:20
Daniel Osborne
There's a lot of speculation whether or not the decat makes a difference. Firstly I had the mx5 parts exhaust already fitted and after fitting the decat I noticed that the sound was slightly deeper but not any louder or raspy. I have a 1.6 Eunos auto and as every one knows they're a bit slow off the mark, well I can happily say fitting the decat has made it a lot more lively and responsive. After I've done the 14 degree timing mod I'll report back for all of you with autos to let you know if it's made more difference. All in all great product, fast delivery, great service as always and would recommend this art as well as the mx5parts exhaust.
27/02/2015 12:16:21
Dave Johnson
Ordered yesterday got deliver next day. Looks great.
28/01/2015 12:16:21

Delivery Information - MX5 Parts

We understand that its really important for you to receive your goods in a timely fashion and for a competitive price. To ensure that we can deliver this we have developed a strategic partnership with both the Royal Mail and our courier partner, Think Worldwide.

At the present time, we only offer one delivery option ‘our carrier’. We will dispatch your goods with the most suitable carrier, for main land UK deliveries this is normally Royal Mail 1st class for packages weighing under 1.5kg and Think Worldwide for those that are over.

Our delivery charges are based on the weight of the consignment and the destination address. For UK mainland deliveries they start at £1.97 for a package weighing under 300g and rise to a MAXIMUM of £9.95 for a package weighing 1.5kg or over (EXCEPT very large bulky items that have an additional shipping surcharge added). The exact delivery cost will be clearly displayed at checkout.

Delivery times are estimated at 1-3 working days by Royal Mail, and 1-2 working days by Think Worldwide for mainland UK addresses. If you order before 3pm, Monday to Friday, we will dispatch the same day. If you order after 3pm, we will try to dispatch the same day, but if we cant it will be the next working day. Items ordered after 3pm Friday or over a weekend will be dispatched Monday. Items dispatched on Friday are for delivery the following week. Items ordered over a Bank Holiday will be dispatched the next working day. MX5parts is constantly updated to keep pace with changes in our stock but demand is high and we occasionally run out of popular items. If we have run out of stock and can’t dispatch your order the next working day, we’ll email or phone you with a revised dispatch date. You can then either accept the revised dispatch date or cancel the order, as you wish. Please note, shipping times are an estimate, and can not be guaranteed. Please note that during special offer periods, dispatch of your order may be delayed slightly due to high a volume of orders.

A signature is required for ALL orders delivered by Think Worldwide. Someone must be at your delivery address to sign for your parcel between 8am and 6pm on a working day. Please send it somewhere it can be reliably signed for, like your place of work, a neighbour, or perhaps your grans. We can (but we don’t like to) ask the courier to leave your parcel without a signature. If we do this, it will be YOUR responsibility if the parcel is lost or damaged. If you want it left, you need to give us your express instructions in the ‘additional information’ box at the end of the checkout process. It would be helpful if you could also indicate exactly where the package should be left.

If you need to change your delivery address, for any packages that have been dispatched with Think Worldwide, there will be an additional charge of £9.95 if the package has already been dispatched.

Please remember, even with Royal Mail deliveries, that any items which are too large to fit through your letter box will need someone to be available to receive the delivery. If the item cannot be delivered, you will be carded and given the option of either a re-delivery or you can collect your parcel from your local post office depot.

Orders sent to countries outside the UK will be sent VAT free, however please note that on all international shipments, the recipient is responsible for any local VAT, import duty and other clearance fees that may be charged.

For further information please email:

We NOW deliver to the following countries:

Baleares, Spain
British Virgin Islands
Burkina Faso
Canary Islands
Cayman Islands
Channel Islands
Costa Rica
Czech Republic
Dominican Republic
El Salvador
France (Mainland Only)
French Guiana
Hong Kong
Marshall Islands
New Caledonia
New Zealand
Papua New Guinea
Portugal (Mainland Only)
Puerto Rico
Saint Vincent And The Grenadines
San Marino
Saudi Arabia
South Africa
Spain (Mainland Only)
Sri Lanka
St Lucia
Syrian Arab Republic
Taiwan, Province of China
Trinidad And Tobago
United Arab Emirates
United Kingdom
United States

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We guarantee that you’ll be satisfied with mx5parts!

We are an independant, family company, run by a dedicated team. We aim to be the kind of company that we’d like to deal with if we were you. You have our absolute commitment as fellow MX-5 owners, car nuts, internet users and hard-working people that you’ll be satisfied with mx5parts. If you’re not, let us know and we’ll sort it out!

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It is inevitable in an open market like the internet that there will be some individuals selling some items cheaper than we do, and some selling them for more than we do, just as in the high street. We take great pride in offering a fast, efficient, friendly and secure shopping experience, with great products at fair prices. We encourage our customers to shop around, but are very pleased to welcome them back again and again.

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If you order before 3pm, Monday to Friday and we have your items in stock , we’ll despatch the same day . If you order after 3pm, we’ll still try to despatch that day but, if we can’t, we’ll despatch the following day. Items ordered after 3pm Friday or over a weekend will be despatched Monday. Items despatched on Friday are for delivery the following week. Items ordered over a Bank Holiday will be despatched the next working day. MX5parts is constantly updated to keep pace with changes in our stock but demand is high and we occasionally run out of popular items. If we have run out of stock and can’t despatch your order the next working day, we’ll email or phone you with a revised despatch date. You can then either accept the revised dispatch date or cancel the order, as you wish. Please note that during special offer periods, dispatch of your order may be delayed slightly due to high a volume of orders.

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We guarantee to accept back any goods that you do not want, are not suitable, have changed your mind about, infact, for ANY reason, provided the goods reach us within 30 days of dispatch from us, in their original condition and packaging. Please tell us why you are returning the items, just for our records. The original purchase price of the goods will be refunded on to the card that was used for their purchase. Sorry, but we can not refund the carriage costs.

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