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Message: <blockquote data-quote="stang4u2nv" data-source="post: 188653" data-attributes="member: 9793"><p>So you are saying that you are going lean on top end is that right? well let me tell you that the air fuel ratio gauge that you are using is worthless because it is a narrow band air/fuel gauge. to really know if you are going lean or not is to drop the car on the dyno or buy a widebang o2 gauge from AEM or Autometer it'll run about 250 bucks but it'll tell you everything you need to know about your air and fueland plus it'll work also if you boost the car or you put nitrous on it so don't be fooled by that gauge it just looks pretty, and pretty doesn't do it.check your timing, spark plugs, or get a fuel pressure regulator if you think you are running lean and bump the fuel pressure a bit say you are running 38 psi boost it up to 42 and recheck or test drive the car. good luck man</p></blockquote><p></p>