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Larry,
You didn't say, or interpolate for us, where the CHT temps were, but assuming they were below 400 degrees and in the green, not much to worry about.... when you get these hot ambient air temps, you're going to get slightly hotter engine conditions. Since you haven't had the airplane THAT long and most likely haven't been through a "HOT" summer, you're probably experiencing anxiety at the increases.
Exhaust leaks will normally appear as whitish whisps... not sure about "yellow", but maybe you should have you mek-a-nick check that the exhaust nuts on the flanges are torqued up properly.
If you're REAL concerned that you've got an exhaust leal, what you can do is hook up a shop-vac and use the 'blower' end -- make sure the filter and the canister are CLEAN before you begin -- so you won't blow any debri into the engine - and then fashion a connection of the hose to the exhaust pipe outlet using duct tape and pressurize the system. Apply some kids 'bubbles' solution or soap suds around the flange connections and over the pipes and watch... bubbles forming are okay, but if the bubbles blow away... then your mek-a-nick needs to do some tightening or look into matters further for cracked pipes, etc.
Not sure how the normally aspirated versions are, but on the turbo P-models, the riser from the exhaust pipes connect using a spring thingee with two nuts on each side...sometimes we've seen these items develop a small crack and start a small leak... sometimes you can reverse these end for end as long as they're not cracked all the way through and get a bit more mileage out of them. Since the manner in which they connect -- they wrap around the outside of the riser -- there's no possibility of anything getting into the exhaust stream and into the turbo... but, alas, I digress too much as you probably have a different set-up on yours.
Probably just the HOT WX!
SkyKing
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