Currently have a 2005 STR and looking for a good set of hi-flow catalytic convertors and x-pipe to add some growl and power.

I did a search and noticed that members mentioned the Magnaflow 59975 for the cats and the Magnaflow 10790 for the X-pipe. Is this the best set-up for my vehicle? Any other recommendations?

Also, this may be a little hard to find, but is it possible to get sound clips anywhere?

Cheers!

 

im thinkin about an Xpipe w/ stock muffler idk the size anyone have advices.. dose the str respond well w/ aftermaket cats??

 

in for this as well.. looking at buying an STR and have a left over Magnaflow X pipe i didnt use on my 350z.
Was curious if ppl used them for the STRs actually already.. cool thread.
BTW, what size is the STR exhaust piping?

 

Stock piping is 2.25. Most of the people that have upgraded have gone to 2.5. Its preference there is some discussion of the 2.5 piping losing a small amount of low end torque. The STR responds very well to cats. If I'm not mistaken its the most restrictive part of the exhaust. There will be more people chiming in on what to use. I only have the mufflers and they are not installed as I'm waiting to buy some cats and an Xpipe and do the whole thing at once. I will most likely stay with the stock piping. I'm just waiting to build my account back up after the holidays since I'm a full time student.

 

I plan on doing just these exhaust mods only as I have a full exhaust(no cats)/cammed LT1 Camaro that makes baby children cry, so I am looking for something subtle like a stock new Merc AMG exhaust. I have both the cats and the x-pipe sitting in my house waiting for more time for an install when I am not traveling. If you can wait 2-3 weeks I will provide a video and review.

Quick question, the 59975 cats I bought dont have holes for the O2 sensors, is this correct?

 

That's the exact sound I am going for as well. I don't want it rumbling all the time, just a subtle growl.

I haven't purchased the 59975's yet so I'm not sure about the 02 sensors, but I imagine they have to be fitted somehow?

 

You will have to get O2 bungs welded in before and after the cats in the pipe. Someone that has had it done can tell whether the wiring has to be extended or not.

 

The STR loves hi-flow cats, x-pipe, and 2.5" pipe. You'll need O2 sensor bungs pre/post cat. The throttle response will become quick and crisp and increase hp.

 

The stock resonator is combines the two sides of the exhaust, so the X-pipe isn't going to be as effective as if the sides were separated...Even if you did a new exhaust, whether or not you get new piping or reuse the stock pipes, you can eliminate the X-pipe expense by getting an aftermarket dual inlet/outlet muffler or resonator...

 

Good advice...using Magnaflow's dual inlet/outlet muffler as an exhaust bank mixer and quieter.

 

how much work/cost is it to get these bungs put in?

 

I just had a pair magnaflows installed today due to a near clog...Wires did NOT need to be extended...Cost me $350 out the door which included everything but the magnaflows ($220 for the pair), he kept the old cats to sell for scrap...He had do new studs on the clogged side so he said he charged me $50 to do that...

I still have a vacuum leak along with RP so I don't know the outcome under WOT, but it sound a little more rumble/grunt...I also had the muffler deletes before and it's nowhere near as loud...

A tad bit of info...The guy said the OEM cat should restrict flow by 3 (I think psi)...He then said the magnaflows should restrict it by .5 So, assuming what he's saying is accurate, don't be fooled by "high flow cats"...If you can find costs around what I paid, you spend $570 on slightly higher flow cats...

 

gud info..

 

Hey 151, have you noticed any difference in how the car responds? I'm debating whether to replace mine. It seems my XKR revs up faster than the sedan does, cant really figure out why.

 

I have a check engine light and a restricted performance due to a vacuum leak so I can't do any WOT runs...

For the price of $570 (by the way, I shopped around and two places quoted me $500 in labor alone, bungs and most likely the replacements would of raised costs so now you're talking $800 total) I don't think it's worth it from a performance standpoint...

My standard propaganda is that nitrous is the best for this car...Really cools down the engine in the summer months...I'd love to do it to mine, but won't put it on the car with a 3lb pulley....

 

So far mine has cost $150(75*2) for the cats and $70 for the x pipe putting me at $220 (no taxes free shipping). A shop quoted me at $100 to do the welding, with the extra work for the bungs I would assume $200 at the very most putting me at $420.00 total at the worst. Assuming I can sell the cats on craigslist for at least $50, that puts me at $370 in semi worst case scenario. Considering most catbacks are $800, and jags are $1500, thats not bad bang for buck. Choose your poison

 

Excellent fiscal point Rasputin.

 

Labor at $150-$200 is an steal; you're getting an awesome...Do share where you found the cats for $75 to help out other owners save $$$...

If I were you, I'd return the X-pipe if you're able to, perhaps you can knock another $25-$50 off the labor so now you're at $250-$300ish for highflow cats...Two X-Pipes are a waste...You even consider buying new buying a dual resonator and two mufflers (or a dual muffler and two muffler-styles resonators) and have them do the whole thing; might only be like $500 out the door...

Even if it cost me $250 for high flows, I'd pass on them for a performance standpoint...

 

Here is a secret about speeding up the top speed of the S type. Buy a used speedo from the USA. It reads out and signals the computer in MPH. However it also has a second scale that reads in Km. The USA version sends a signal to the computer saying you are moving at less speed than actual speed. No performance increase at lower speeds. But my Jag does 170 MPH with the new speedo. You can find a used speedo on Ebay for around $250. Makes life on the Autobahn much more interesting. Cheers,

 

What did you do about the security system?

Which actual Jaguar car do you have that you did this on?