Daniel24 Posted September 23, 2009 Share Posted September 23, 2009 What are your recommendations for easy and effective performance modifications for the 1990 -94 LS400? Inexpensive would be nice. Quote Link to comment Share on other sites More sharing options...
Ross W. Posted October 7, 2009 Share Posted October 7, 2009 The most bang for your buck IMO on the gen 1 cars is get it down to a good muffler shop, and have them replace the stock mid, or "B" pipe, replaced with individual tubes, with an x pipe at the recommended location. The stock unit is extremely restrictive, and replacing it I've heard is good for about 25 hp, which will be noticeable. Keep the new center exhaust tubing the same size as the rear exhaust. Aside from that, a free-flow intake would be a good choice; Luxurymods.com list a couple. HTH! Quote Link to comment Share on other sites More sharing options...
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