[Dragon-gt02]

Hi, i need really help:

I have a mustang 2002 4.6L stock, only CAI Mac performance

Headers: Stock
X-pipe: Bassani off road
Flowmaster 40 and cat-back stock

but the sound is very very bad, please if anyone now, tellme please.

Note: sorry for my english, but i don't speak english

Thanks

[coolwaterblvd]

Try different exhaust tips on the rear and put a set of cats on the cat- back exhaust. You will also get a little more TQ on the bottom end the needs the back pressure and will mellow the sound. The stock cats flow very well and just cut out the ones right before the mufflers and have them welded into the Bassani x pipe in the same location that the stock ones would be. That is what I did and it sounded much better and I got my Low end Torque back.

[Dragon-gt02]

Ok, thanks Coolwaterblvdi well try in then i say you.

[Dragon-gt02]

Hi Coolwaterblvd, thanks by the tip that you gave me on the sound of my car listens itself very well, thanks again

Rogelio

[Langod]

I'm running basically the same exhaust except for the Bassani -- Flowmaster 40s and stock piping along with a MAC O/R H-pipe. I have no lack of torque, so all else being equal the Bassani X-pipe must be the problem. (I've heard the X's are better for HP and H's are better for torque...)
Adding my MAC O/R H-pipe gave me approx 25 lbs of torque according to the dyno.

I've never heard of Exhaust Tips creating a difference in torque or HP -- can someone explain that?

[kd00gt]

Exhaust tips?!?!? I dont think anyone can explain that one... Pretty damn funny to me... You might as well put some new headlights on as well.. hell that aught to be good for 10-15 extra horsees.. )

[UnleadedEvil]

The problem your having is that when an X-pipe is paired with any Chambered muffler (Flowmaster, Borla, Magnaflow, ect) creates a new exhuast note (that many people don't like). That is why the H-pipe or Prochamber are the prefered choice when using a chambered muffler. If you want to keep the X-pipe and get a more desired sound your going to need to switch to a straight thru muffler type.

http://www.youtube.com/watch?v=StvXfWLqljg

Here are three different exhaust types, The white GT is basically what your car will sound like (with a little less rasp) if you either put the stock H-pipe back on or buy an after market one.

Here are some snips I took from http://www.flowmastermufflers.com/

Do I need to install an "H" pipe to my dual exhaust?
Flowmaster strongly recommends using an "H" pipe, commonly known as a "balance tube" on all "true dual" exhaust systems. An "H" pipe equalizes the pressures between both banks of the engine giving a broader and flatter torque curve throughout the rpm range. It also eliminates "back-rap" common on deceleration, and creates a deeper mellower tone both inside and outside of the vehicle.

Is an "X" pipe better than and "H" pipe?
Over the years, Flowmaster's testing of all types of crossovers, including "X pipes", has revealed no substantial benefits over a properly installed "H" pipe on street driven applications. However, in race applications with small cubic inch engines and /or restricted (small bore) carburetors, will respond well to the addition of X pipes, tri-y styled collectors and/or properly designed single exhaust systems.

Anyway, I have the Mac O/R H-pipe and the Flowmaster 40's and I couldn't be happier it has a deep muscle car growl. The preformance difference between the X-pipe and H-pipe will be insignificant unless you are making ALOT of HP. If you really can't decide just go with the Mac Prochamber for the best of both worlds.

Oh and for the love of god, don't do anything to your exhaust tips or start welding in cats lol.