adamsison 0 Report post Posted March 25, 2006 i have a 2.25 inch press bent exhaust on my e36 325i manual, i was wondering how benefit a 2.5 inch mandrel bent exhaust would improve performance of on my car? i plan to get extractors/headers also. should change both or just the extractors for better performance will the cost of the new exhaust be worth it? any help would be great. thnx Quote Share this post Link to post Share on other sites
bmwsparkle 3 Report post Posted March 25, 2006 absolute no point changing it to mandrel. 2.25 is prolly quite a good size. Extractors, definatly. Quote Share this post Link to post Share on other sites
