I have installed a RM ad203 mosfet board in a trc453 radio in the past..... the radio crapped out and I had this board with no home. I could not just leave this thing alone. I had to play. I took the guts out of the trc453 and kept the AD203 in it. I bought a used trc453 off of ebay... but that is another day of playing. I bought a new meter to check swr and power . I am still running a Gainmaster with very low swr at 4.5 watts. on my CB's. The AD203 is only giving me 35 watts ssb and 10 watts am. I saw a video on Utube that will increase your wattage but if u think about it for awhile the power increase seems way too high for the board. So I will not cut r1 and jump to r3 and r4. I would more likely change the mosfets to a higher output mosfet. I would also think about cleaning the signal up. I would hate to sound like channel 6 apple splatters.