Supertrapp IDS on TTR 250

A friend has a new Supertrapp IDS racing exhaust which he had on his TTR but only tried it on but was too load for him. What is your opinion on performance gains on my 2002 TTR 250, with opened air box, twin air filter and 140/52,5 jetting, needle in the middle clip?

I have a drilled stock exhaust from the previous owner which IMO just makes noise and reduces the performance. Presently I have a rich bog from mid to top with the fuel screw @ 3/4 out. Will bike run better with the free flowing exhaust, or should I reweld stock exhaust and lower main to the original stock 147 jet?

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