|
As for how long I'm following BMW community(past 4 years), I didn't hear that any piggy back has caused an engine/turbo issue.
In fact there are some piggy back which works ok, other are not so well.
HJS 300 is bit expensive compared to regular wagner downpipe but it shouldn't trigger a CEL.
If warranty is your main concern, and you feel that you might be unlucky until it expires then go with AC Schnitzer piggy back.
You can trow in any downpipe, and in the case that your engine breaks down just switch it the original one.
But, if you want to get a cheap and reliable upgrade, just get a 200 or 300 cell downpipe and bigger intercooler.
You can easily shred of 2 seconds from 100-200 km/h time without a tune.
|