McGahan had just had the pleasure of watching his side destroy one of Europe's most-talked about teams in simply sensational style.
Toulon arrived in Limerick on the back of an opening-round win over the Ospreys but they were put to the sword at Thomond Park.
Munster cruised to a 45-18 bonus-point win and McGahan was understandably delighted.
"It was a very solid performance from us," said an understated McGahan.
"We'd been building slowly to get a performance like that - today we were good enough to put it together.
"The biggest thing we had going for us today was the pressure that we applied. We applied that very well through field position, through the set piece and I thought our defence was very good.
"More importantly, we controlled the ball and that gave us a great platform to play, particularly with where the game is at the moment."
Munster went into Saturday's encounter knowing anything less than a win would leave them with a mountain to climb in order to make the knockout stages yet again.
Defeat to London Irish had been tempered by the manner in which they picked a losing bonus point in the last minute at the Madejski Stadium but they still knew only a win would do against last season's Amlin Challenge Cup finalists.
Throw in a narrow Magners League reverse at the hands of Leinster a week earlier and Munster knew they had to make amends.
"In both games against Leinster and London Irish we had patches of pressure but we really put that together and played for longer stretches of the game against Toulon. We finished off our points as well which we hadn't been doing," added McGahan.
"We've had sustained bouts of pressure but we'd left with no points, which lets the opposition off the hook. That's what we've done in the last two weeks…but there was an opportunity here and we took it.
"We certainly recognised that, with the tightness of the group, if we'd have lost today, it wouldn't have put us completely out of the picture but things certainly would have been out of our control.
"This result means that we can control things at this point in time. That's what you want at the end of Round 2.
"We're happy with where we are but we recognise that the Ospreys back-to-back in December, with their performance on Friday night, is going to be a very difficult task."