Does anyone have a part number for the Magnaflow hi-flow cats? And how much power do the really free up? I only have 13k miles so i am thinking..are the stock ones really that restrictive?

Also, is this the correct X-pipe: http://marylandspeed.com/magnaflow-2...791-p-763.html ?

Thanks!

 

08ZO6, Riski should be writing this post as my zealous responses have brought him close to nausea. Since he hasn't risen yet from last nights cougar chase, I'm compelled to give a speedy answer...Considering your STR's very low mileage, it's highly unlikely your cats are toasted. However, I know they are much more restrictive than the Magnaflow hi-flo cats, like night and day. With hi-flo cats you'll have much more throttle response thus more power. I'll bet my full exhaust mod allowed an additional 25+ hp, the recent 1.5 pulley another 25+ hp when the new blower belt goes in Thursday. My hp claim seems reasonable as it reflects the manufactures claims too. Most pulley upgrades have only a cat-back mod thus don't realize the additional power held back by the stock cats. It's really that much of a difference. You undoubtedly feel it in the pants, tach, and speedo (with a full exhaust and pulley mod). And for whatever reason the trans shifts higher in the RPM range too. I'm now very much looking forward to an ECU tune; may do EuroToys? This mod may unleash another 25 hp and big torque gains. You have the correct Magnaflow x-pipe. I don't have the cat part #'s but can easily be found on Summitt (Magnaflow 2 1/2" inlet-outlet "Spun", 11" long and 4" diameter, $75/each. You won't be disappointed.

 

Disregard my previous pipe segment question -- I discovered that there are relatively inexpensive universal kits for about $200, with random-shaped segments to be able to form whatever is needed.

In the absence of a universal kit, I also got hooked up with a guy that can cut/weld straight pipes to form whatever angles/lengths might be needed. My thinking, though, is that the flow benefits from mandrel bent piping (from a universal kit) will be considerably better than that from a weld/cut technique.

Thoughts?

 

Mandrel bends maintain the inside diameter of pipe at a bend, thus afford a path of less restriction.

 

Part #59926 fits bfsgross's description perfectly...however, it is slightly more expensive than his $75 price--I am guessing this is because the substrate is metallic instead of ceramic. Summit offers these at $104.66 each, but they are available at Wholesale Magnaflow for $96.29 each (free shipping!).

My knowledge of cats is relatively limited...but from what I could gather, the metallic substrate is preferable for modified engines, as they (metallic substrates) withstand much higher temps. Might be worth the extra $20 each if you plan to do more work...

 

I asked my guy at the dealer and he said changing the cats might mess with the powertrain warranty. Also he said it would probably set the check engine light and throw the ECU out of whack. Can anyone with info on this chime in?

 

Re: Your "...guy at the dealership"... A. He doesn't know what he's talking about except knowing how to "Deal" very well. B. Exhaust mods will not void powertrain warranties. C. Changing the cats will not upset engine function thus set off codes. D. Jaguar ECU's adapt very well to changes in parameters. I've had my exhaust modded for nearly a month now and not one code except crisp-responsive throttle response and a noticeable gain in power.

 

Is that part# for the CAts for the STR 03' models? if not does anyone have a part# for the hi flow cats for a 03' STR. My passenger side cat is breaking apart inside making clicking noise when driving, so I might as well get the other side done as well.

Thanks!

 

Jag79, there isn't an aftermarket direct fit cat for the STR. I used the Magnaflow "Spun" hi-flow cat. It's easily found on Summitt Racing under Magnaflow catalytic converters. I don't have the part # because I had Summitt Racing direct ship to exhaust shop, so they tossed the reciept. I do however clearly remember they were the "Spun" (no seams) design with 2 1/2" inlet-outlet, 11" long, with a 4" diameter.

 

I'm sorry guys. Yes, the Magnaflow hi-flow cats were just over $100/each, not $75/each.

 

For you guys who have seen your stock exhausts...can you take a quick look at this thread https://www.jaguarforums.com/forum/s...528#post209528 , and glance at the first photo (custom exhaust, apparently almost identical to Riski's). Then, look 4 posts down from that one -- there is an older photo of the same car, with what appears to be the stock resonator and piping.

A question -- in the second (lower) photo, is everything still stock EXCEPT for the mufflers and tips? Then, if the answer is yes, can you tell me if the pipes shown in the first photo (between the x-pipe and mufflers, and in front of the x-pipe) are the exact same stock pipes, just powdercoated?

If this is the case, I can stop handwringing and spending so much time trying to find piping that will fit custom applications. Please tell me somethin' good.

 

grrr disregard my previous post, it appears the stock piping is 2.25". I feel like I should be using 2.5" here...

 

I ran 2.5" throughout my exhaust....

 

after reading all of this exhaust stuff, it seems like it should be the first thing done to an str. My problem is, even though the magnaflows sound awesome in these setups, is there anyways to keep the performance, but quiet it down some? The reason strs are so great is the fact they are such sleepers, and so quiet, plus, I want the supercharger scream to stick out as much as possible!

 

Thanks bro for clearing that up, going to take a look at summits website for the non-seamless "spun" magnaflow cats. Now I just have to find a good welding shop who does exhaust work, lolzz

 

...by the way what size tips are those magna flows? They look like 4"??

 

Drjs, you can run 2 1/2" inlet-outlet hi-flo cats to 2 1/2" inlet-outlet x-pipe, to 2 1/2" pipe (delete the stock resonator) dumping into Walker's Dynomax Super Turbos (2 1/2" center inlet 2 1/2" offset outlet, two glass packed baffles) if you are concerned about an overbearing exhaust note. You'll have a nice blend of supercharger whine and exhaust rap. If you go with the Magnaflow mufflers you will definitely have more exhaust rap than blower whine. And yes an exhaust mod is first in the order of things.

 

I have a set of NIB Hi-Flow Cats for sale.....100 bucks shipped

 

Would someone please f$%^n buy Riski's hi-flo cats so they may gain fast-crisp throttle response and more power!

 

I'll buy them if they are the magnaflows, i just hope they really are worth doing!

Can you send me a PM with your paypal risk? Thanks