Hi krono !
If you're refering about my VX well the current mufflers was a experiment,though i could try with regular mufflers first,now i'm convinced the dynomax are the way to go.
The shop i deal with is belongs to a former isuzu engine specialist & good friend (can't be better) plus he used to own one of 1rst 15 VehiCROSS imported into the US back in 1998 (ironman) i guess i'm very lucky to have him located just 2 miles away from my house.