Originally Posted by Juicer
The stock DPs probably weight 3x what the aftermarket pipes weight. Also the stock pipes are bendible/flexible.
This & a poor install are the main reasons why people get subframe rubbing issues from a DP install. After installing catless DPs & being unable to resolve subframe rubbing issues (they were installed by a BMW mechanic so they weren't installed wrong), I opted for Akrapovic DPs because they had both a flex section & the subframe mounting brackets.
They went right in like OEM & I ended up wishing I bought them from the start.