Originally Posted by jpz_67

Hello all, looking for input on the tuned grp promo package. I have only had 1 grp motor ever and it was mugen ninja bo1a, I loved it. Strong smooth usable power but was only disappointed in 1 area, the runtime. I used the recommended pipe and ninja glow plugs but could just barely get 8 mins to a tank in a mbx5r. Is the grp tuned 21 in the promo kit really any better? I have read a lot of testimonials on how these motors get excellent fuel mileage, the same was with the ninja and I never saw it. I know there are a lot of variables but some motors have a reputation to get great fuel economy no matter what the conditions such as the v-spec. Not looking to get flamed but just some good, honest feedback. The price of the promo kit has made it more reasonable to try this motor out, they are on sale everywhere I shop. Also I would be dropping the promo kit in an mbx6 buggy and as some know the chassis is kind of a tight fit when it comes to pipe and manifold selection, so with this being said does the grp pipe and header fit without any major mods? Thanks .