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

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

£74.95 inc Vat
by alex macrides
Date Added: Wednesday 20 July, 2005
Usual great prompt delivery. After reading all the reviews for the Cat bypass pipe I decided to go for it, took peoples advice and got new gaskets as well (only about an extra fiver more), and a set of nuts, bolts and washers from my local garage. Would be nice if these were included in the kit or maybe a reminder on the Cat Bypass web page to put an order in for these as well! (Hint!)

After fitting it to '94 1.8si (standard factory manifold and box), just touching the throttle above idle and that LOUD rasping noise alot of people were writting about was definitely there.
Hmmmm, not convinced this was right so I jacked the car back up and started the engine, I put my hand just in front of each join of the pipe and could feel them slightly blowing at the base and not the top of each gasket. I used a small jack to push the bypass pipe up closer to the chassis to try and close the gaps at the base of each flange and re-tighten the bolts but this had no effect, I know it's wasn't a case of 'lack of strength' to tighten the bolts (I'm 6'2" and 16 stone!) so some Fire Gum was used to plug the smalll gaps (only about 2 mm in width). This worked a treat! Kept the engine running for about 20 mins to set the gum and then back out for a spin. The drop in volume was DRAMATIC, yes there is a SLIGHT deep rasping noise added to the exhaust which does sound VERY VERY NICE, smooth and sportier and is just about right for the extra power you get, especially around the 3000 rpm mark, but it's not any louder than before the Cat converter was replaced, just deeper, and how it should sound.

In MX5parts defence, the misalignment could easily have been caused by a slightly 'warped over time' or a bent exhaust. (f****ng speed bumps!) So do not let this put you off!

I suspect other reviews I've read about the "loud head turning rasping sound" are by badly fitted pipes that are blowing, you should hear this sound only from the exit pipe and not from underneath the middle of the car, so buy some Exhaust Fire Gum just in case, (about 3 quid a tube from any garage).

Overall this is definitely worth every penny, it's solid, well made and does give you that little extra OOMPH (and a cheeky smile on your face!) when you hit the gas, so do whatever you have to do to get one, sell your Granny if you have to!

On a test drive it has pulled the 0-60 down to 6 seconds, just saving now for a filter chargrer and then it's BYE BYE GTI!
Rating: 5 of 5 Stars! [5 of 5 Stars!]

Average Customer Review: 4.5 of 5 Stars! [After 92 Reviews]

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