daveyboy Posted June 6, 2003 Share Posted June 6, 2003 following on the my problem of getting more boost i wondered if anybody knows how good the jasma 5zigen back box is? appart from being very quiet . is it a good upgrade? it was put on the car in japan. there is only one on the car coz ithe second pipe has been done away with. even with both cats out and no middle box it still v quiet . purrs like a kitten.could this be restricting the flow of gas?? or is it a pukka exhaust. i was wondering if i dared to take it off and go for a spin to see if i gain the extra boost i am missing. but its very close to the petrol tank. so i could be looking for a supra in heaven when it blows me up!! so wot do you guys in the know think about this back box . daveyboy sorry missed out the word knows Quote Link to comment Share on other sites More sharing options...
Guest Martin F Posted June 6, 2003 Share Posted June 6, 2003 Jamsa are some sort of Japanese approvals body which all exhausts have to be tested by. Nearly all the Japanese exhausts have a Jamsa plate on them. Zigen exhausts are not too popular in this country, but i don't think that means they are necessarily bad. Quote Link to comment Share on other sites More sharing options...
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