never noticed there was a question on this. was looking for a picture with my boss seat on it. The mod is good for two reasons, first, there is no expansion tank in a red head, they use the rubber hose as an expansion tank, hard to see if you have lost any fluid with a quick look. second, the viper oil filler is really big and is alot easier to fill. you can not use a viper box because like a srx box, they use inside air from the sled. each one mates up differently but the result is the same, though many believe the viper to have air induction because of the fake air intakes and dash pan tunnels. The red heads couls(other than venom) mate the air box to the coul with air coming from outside the back of the coul. a cold air intake so to speak. There might be some advantage noise wise to use a viper inner plate from the air box. it is made with a few resonance cones for noise reduction. I never tried it.