We lock our exhaust valves open on our GT4 with some old high temperature 1/4” fuel hose and some hose clamps. Be sure to use a hight temperature rated hose because the exhaust gets HOT!
Link to get some fuel hose with clamps https://amzn.to/4e8y5Y9
Download your shop manual from eManualOnline.com in the link below:
Cayman 981 https://shrsl.com/4ogkj
Boxster 981 https://shrsl.com/4ogkj
911 997 https://shrsl.com/4ogkv
For a very limited time, Emanual Online is offering customers 22% off of their entire order with discount code. Use code EDDY22 and get 22% off your order. https://shareasale.com/r.cfm?b=510988&u=4414787&m=49176&urllink=&afftrack=
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But is the performance there with the noise???