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In today’s video we do one of the most effective modifications for the n55 bmw engine. This mod gives you 70+ horsepower with a tune. Many people get their catless or high flow downpipe from places like VRSF but I got this from AliExpress which is the same company that supplies the one you find on eBay and my review is the parts are virtually identical in quality and performance. My f10 is now ready for its intercooler and a tune so I can make 400hp or more in my 535i.