The pops and bangs will also contribute – it’s why you’ve probably noticed the back of the RS gets a dirty aRSe quicker than other cars you may have owned :D.
My old Impreza had antilag with an aftermarket ECU (as opposed to the fake pops and bangs you sometimes get on the standard ECU flashes) and the rear bumper was constantly filthy!
Perfectly normal just probably the standard map runs quite rich, infact even a mapped car will still get it. Just coat the inside of the exhaust with a sealant when new so its easier to keep clean
<p style=”text-align: left;”>Hi Kenny, which sealant is best to use on the inside of the exhaust? Hopefully when my RS turns up i can do this from new. My ST2 is really sooted tail pipes.</p>
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