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Not without making up a new screamer pipe from scatch I don't think based upon the angles of the current return. Backpressure shouldn't be an issue though as the straight gate isn't affected by backpressure in the same way that a poppet valve is, and on top of that the exhast system is 4" all the way through so there should be minimal pressure if any to begin with. -
Can you vent the straight gate to atmosphere easily for testing? -
Heres a dyno log comparing MAP TPS RPM TURBO SPEED Each hump is 2nd, then 3rd then 4th gear. This particular log is using gate pressure with the mac valve completely removed. As you can see it spikes to 23psi, and then drops to 20psi over the course of approx 700rpm, this is the minimum pressure the system will run using a 12psi spring. I think my next set of logs will be changing the spring to the 6psi spring and going out and doing another set of logs again and see if the spike is as dramatic. As you can imagine if it spikes 3psi on wastegate pressure, that increases to 5-6psi of difference in the higher boost levels approaching the 28psi target with the mac valve. I even have a few logs here where with the mac valve targetting 28psi, the haltech is seeing 38.6psi....
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I've got a spare standard box sitting in the garage I know it will come one day though, but it's driven pretty tamely on the four times a year it gets out...
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Big question… have you decided on a gearbox? Because it’s going to come… and a gearset ain’t going to do the job. save your pennies 🤪
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