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The more restrictive cat is the one in the manifold so that would be the one you'd want to remove, but you'd need a remap as the sensors surround that one.


Getting performance on a budget all I would do is replace the panel filter with a Cosworth one (~ÂŁ40), add a silicone intake hose (~ÂŁ110) (halved the cost of the induction kit for similar performance which really is 4-5bhp at best, probably wouldn't even notice it due to dyno variation, but getting rid of the sound generator makes the car sound more natural) and PS4 tyres, then save up to do the manifold and remap in a single session. Tuning developments package includes a filter but they offer a drive in/out manifold and remap for ÂŁ1500, then eventually whatever second hand catback you can source to fit your noise requirements.



Ideally whatever needs the remap is the last thing you'll want to do, otherwise you'll be forever going back to have the map adjusted for whatever you've bolted on since.
 
Well, technically one can drive just fine with catless header on stock ECU tune too, it may even give slight powergain and eg. fill torque dip .. issues w/o appropriate tune are two - gains will be partial, and due no cat CEL will be thrown, making car not MOT passable. Tune helps with those two bits, allowing to use more effective exhaust design for more gains and disabling cat readiness checks, but one can drive even without it (even if most won't)
 
If you are h*ll bent on being quicker than the car next to you I would shy away from an 86. It's really not a car for that, in reality you are just gonna end up frustrated unless you go forced induction.
 
0-60 times are all over the place for this car depending on where you look. People have managed to do it in 6 sec! It's all about tyres and the change in to 3rd gear. The stock tyres hold the car back a lot if you want better acceleration.

The best you can do without a SC/turbo is a better manifold (removing first cat) and a remap. After that you won't gain much by adding extra things.
 
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