This exhaust modification is the least expensive of them all.  That is nothing to be embarrassed about. This was the very first mod that I did! This allowed me to get my feet wet, so-to-speak, without really forking over a lot of money.  It simply requires that you replace the factory muffler with a high-flow aftermarket muffler.  There are many "generic" high performance mufflers available. They are generic in the sense that they fit MANY cars and are not specifically designed for any oneparticular vehicle. These are also known as "universal" (fits some better than others) performance mufflers. These mufflers are simply chosen based on physical size constraints such as what size will fit in the stock muffler's location. They are designed with common inlet and outlet diameters that allow them to be fit into just about any application.  The most common name brands are probably Flowmaster and Dynomax.  Both have been around for a long time and make quality products. 

Beside the muffler, there is one additional part needed to complete this setup; and that is a tip. Since the factory muffler has the tips integrated into the muffler, when it goes, they go. There is a nearly unlimited choice of styles and sizes of replacement tips however.  This is a photo of the Bosal/ Brospeed which shows the 4.5" (left) tip that I had on my PGT before I had the GReddy installed.

Caveat emptor: Although this brand is popular, I must caution you;  the inside of my tip rusted/ tarnished badly within only the two months that it was on my car.  I live in South Florida, so I am sure that the rain had something to do with it.  Either way, their tips should wear better that.  My advice would be to hold out for a completely stainless steel tip if you live in an area where it rains or snows.

As I had previously stated, this is an "affordable" upgrade...comparatively speaking, of course! These prices are only rough estimates, but they should give you an idea of what to expect:

This may still sound like a significant amount of money to spend, but believe me, this is cheap compared to other mods for the Probe.  Start saving now!  It was after this mod that I started working extra hours for the next upgrade!  

When I originally installed my Flowmaster and Bosal tip, I really wasn't sure what to expect as far as performance or sound.  On the drive home from having the work done, I gave it the "butt-dyno" test drive.  Low-rpm acceleration seemed unaffected by the addition, but a few redline runs told the real story.  Any acceleration in the mid-to-upper rpm range felt much more substantial.  The engine seemed to wind out quicker and have noticeably more pull.

I would say that an 8-10 HP gain in the upper-rpm (~4500+) range would be a reasonable guess.  I was hoping for some kind neck-snapping increase in horsepower, but remember, this was just my starting point and I had no idea what to expect. 

If you already know that you will want to continue to upgrade to get the maximum performance possible, save your money now and buy a cat-back system.  When I got this mod done, I was just anxious and wanted to get something done ASAP! The money that I spent on this mod was worth it for me to get some perspective on the whole concept of performance mods, but I knew even as I drove home, that this was just the beginning!

The sound level may be an issue for some people.   All performance exhausts will be louder than the stock, but these types of mufflers with resonating aftermarket tips, are the loudest of the three exhaust mods on this site.  This becomes a real problem when there is droning inside the car.  The volume of the exhaust is as loud in the cabin as it is on the outside.  Sure, it's cool to hear how your exhaust sounds, but after a while, it's a little much.  

The Flowmaster/Bosal setup that I had, droned terribly.  This was at its worst under acceleration, however, it was tolerable at highway speeds.  Other than that, there was always the constant "rrrrrrrrrr" inside the car.  This is a side-effect of most performance exhaust systems, but it seems to be particularly distinctive of these type of "low cost" mufflers.  I suppose that you either get used to it, or move on to other (presumably better) exhaust systems.

OK, but what did it look like on the car?!  Well, everyone has different tastes so you will need to pick your own, but here is what my PGT looked like with the Bosal/ Brospeed tip sticking out....

In the "undercarriage" photo, you can see that the Flowmaster has been mounted in a vertical position.   This was done so that the tip still exited the car at the factory locale.  If the muffler had been mounted the standard way, the tip would have been offset several inches one way or the other.

If you have any questions, feel free to e-mail me. 

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