alright so i just installed my 4-1 obx header dp combo on my 07 cobalt..there was a couple of little modification that had to be made on the flange that bolts to the block but other than that it went on fairly easy... the only problem im having is that when i accelerate i hear a tinking sound... but only wen i accelerate.. i thought it might be the gasket but it was fine... has anyone else incountered this problem ??? im about to start bottle feeding this bad boy but wanna solve this problem first.. thanx

 

exhaust leak from the ball joint

 

theres no ball joint on these headers.. its the 2.4 header dp combo... its driving me crazy

 

 

if you a cat that might be it my res keeps coming loose on the inside and makes like a rattling sound

 

no its catless... but the car runs like a champ... it really opened the car up

 

Under acceleration, your motor moves witch can caus ethe exhaust hit off the floor, firewall, heat sheild, and the rear axel, check the clearance, and while the car is in the air get a friend to rev it for you and see if it happens then

 

maybe its hitting the metal coolant line that i had to beat up to get it to fit anyone else have this problem ?

 

you beat a coolent line?
you mean the heater core lines that got into your fire wall right?

 

yeah sorry thought it was a coolant line

 

Do you have Coolent on your floor yet then?
i would be very careful with that.

 

na i check every night after i come home from work no leaking and coolant is still full... i guess ima get under neath her to see if the vibration is coming from the heater core line hitting the header

 

i dont plan on beating any coolant line if i install it

 

I beat my line..2 Gita from a 1/2" drive rachet and it was good, it's a hard line u can hit it to move it over, I've done it to 3 other cobalts already...no harm as long as u do it right