Hi, i've got a 2003 Volvo S60 2.4T, and I'm my cars is haveing a strange behavior.

When I accelerate to full gas, when I pass the 100km/hr, the car feels like is pulling, and then halt and then pull another time and this goes on, It really feels a lot I think it has something to do with the turbo, but I'm not sure.

I've got a Custom Downpipe and catback in 3", I don't remember if this problem was happening with the oem cat and catback. So if you have any idea of what could be causing this please tell me.

the car has all oil changes always uses premium gas, and has about 56K.

my car: http://www.cardomain.com/id/chapioshgt

Thanks

Viva Mexico!

 

Might need a software upgrade from the Dealer.