Info: Many Exhaust Questions Answered 3800 Engine
#23
now whats that crossover pipe for?? do you still have that if you have aftermarket headers??
Obviously you still have to use it with aftermarket headers- where else are you going to run the exhaust from the front 3 cylinders?
whats the difficulty level on installing aftermarket headers??
#26
oh okay thanks, but what if i decide to go the route of true duals?? will i still need to use the cross over pipe?? no right?
It kinda depends how your headers are designed though- for example, the pacesetter headers for the 3800 runs each bank of cylinders into a single tube- and then combines the two front and rear tubes in a Y in the downpipe area. Thats why people tend to use those headers for doing true duals, because they alreay have two separate pipes halfway down the downpipe area- so all you need are two custom shorty downpipes, and then the rest of the exhaust which any exhaust shop could do.
However, I really don't recommend true duals- you add a ton of extra weight for no power gain- especially on a nearly stock car. You can still go much bigger than stock on a single exhaust (I mean heck, they make up to 4" single exhaust tubing and components) than your engine would ever need- I mean the Supra guys are doing 1000whp on single 4" exhaust with a 6 cylinder.
You can't go true duals on a sideways motor with no room to run any piping.
The only thing is- I haven't seen any that had cat's- so it would be hard to do in an emissions testing area. Two of the setups I saw were rear outlet with just mufflers at the rear- the other one was side exhaust- forget what he did for mufflers.
The thing is, doing a true dual you can go much smaller on the piping size. Obviously some pipe hangs down below the floor board- but so do all people with side pipes, people with cutouts, etc etc. I mean there are people that daily drive with side pipes on wbodys- and the whole pipe is hanging below the floor pan and is running almost perpendicular to any objects in the roadway that may hit it.
I really always have dreamed of doing true duals on my GXP- just so it doesn't sound like a truck through the single exhaust.
#28
Also... Can someone please give me advice on K&N cold air intake system? I'm very interested and want to know more about it. Best and cheapest place to buy the system, advantages to the system, easy do it yourself? Thanks!
#29
zzperformance.com sells one called the wizaired, much better.
coldairinductions.com actually has one for the 3800 now, and looks like a really good system too.