Take those pod filters back to where you go them and get your money back!! They are a tuning nightmare, extremely sensitive to temp/pressure/elev changes, and you will enjoy buying numerous pistons using them. Hard to get a starting baseline too, gotta go way up in jet size. Stick with the factory airbox, they are highly engineered to match your engine for a reason. Pods are good for grass dragging only IMO.
For other items to check....suspension bushings, check W-arm for cracking, clean carbs unless you are confident they are, check fuel lines especially at spring clips for any cracking, same for oil lines, check carb boots/instake boots for cracking, check choke plungers on carbs are freely moving and adjusted with slight freeplay, check bushing and buttons on secondary clutch, check all moving parts in primary, look for cracking at base of primary, clean and adjust powervalves. Check all tie-rods/heim joints in front suspension. Check/adjust drive chain tension and oil level. If ambitious, pull cover and inspect gears/chain/bearings for wear. Check anti-freeze temp rating and level. Fill up oil tank! Check that plugs are BR9ecs, that's what should be used in an SRX. Look generally over the various wiring on the sled, and look for spots where wires are chafing, etc. Grease up all lube points on sled. That'll keep you going for a couple hours...LOL