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The custon ehaust I had fitted is a stainless steel cat back set me back £400 the company that did it have a good reputation. I had a feeling I may have to have it remapped tho to get rid of the flat spot just wanted to see if anyone else has had this and had any other cheaper ideas to try
Any way round this problem I thought it could possibly be shitty spark plugs got some ngk platinums on order I have bosch super in at the mo didnt have a flat spot untill either my custom cat back exhaust was fitted or those bosch sparkys were put in I cant remember