ok lets start with the smoke problem... it doesnt do it every time that i can tell but when i start up my truck a puff of smoke blows out. whit not black. and it hardly has a smell to it.

second, the exhaust. i want it to be louder and i already have flowmasters and dual tiips. how much louder would it make it to remove 2 of the four cats or should i just go with removing all of them.

 

bump. plz reply.

 

For the smoke problem, you need to include some truck info.
Year,motor, mileage?

Some guys cut off 2 cats,,,should make it louder. (also need to check the laws in your area).

Myself,
I cut off all 4 cats and replaced with 2 high flow cats. True duals and long-tube headers and it screams.

 

99 f150 with 151k. im in oklahoma and my step dad is the liuet. for the police force so im not too worried about it. pluss i hear loud trucks all the time and never see anybody get pulled over for it. only thing cops here pull people over for is non working lights. jack asses.

 

For the cheep way,or should I say inexpensive way. Start buy cutting out 2 cats and see how you like it. Should sound good like that with the flowmasters.

The smoke could be a stuck or leaky valve letting a little oil build up wile sitting.
Or could be a slow head-gasket leak, letting a little coolant into the cylinder and it burns off on start up.
I have heard some good things about this cleaner called Auto-RX. It might unstick a valve, but don't bother using any other oil additives. They do nothing!

 

my favorite is seafoam. never let me down. i prolly need coolant to so ill throw some head gasket sealant in there just in case. i have no lose in power so i dont think thats it but you never know.

 

If your low on coolant,it could be a bad head-gasket. Hope not.
I would try the cleaner first and see what happens.
Don't try to fix two problems at the same time,,,or you may never figure it out.

 

well it will never hurt to use it. prevenative maintance. yup