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Good afternoon polo people. I hope you are all extemely well and not sunburnt. I'm looking for some guidance on my exhaust if anyone can give any. Also open to opinion or discussion. I have a 1983, 1043cc breadvan. Previous owner has removed mid section flexi pipe from exhaust and replaced with straight section of pipe. Not sure about internal diameter. The guidance i'm looking for is to do with how the diameter of the exhaust would affect the running of the engine. The back box, outlet mani and downpipe all look like stock. Just that mid section that's been changed that i'm aware of. If the internal diameter of that section is different from the stock flexi pipe, how would that affect how the car runs? Would i need to adjust my fuel/air mix to compensate? Would it make the car less economical? Would it affect the gap on my plugs? Would the backwards pressure be different and how will that affect the engine working? Would it affect the response at different points in the rev range and gears? Would i be better off going back to flexi pipe? I understand some guidance will be speculation as i can't give an accurate id of exhaust pipe. Engine is stock, carb is manual choke, weber 32ibf, main jet changed to suit engine, custom carb mount. Stock dizzy with points and condensor but changing that to refurbished one with electronic ignition next week. Thanks for stopping by and any guidance you may be able to leave. I appreciate your patience with this as well considering the info i have.