Xpipe and High Flow Cats

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Oct 21, 2004 | 02:52 PM

jcook00

Thread Starter

Instructor

Joined: Jun 2003

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From: Austin TX

Xpipe and High Flow Cats

Any idea how many ponies I could pick up by adding an Xpipe and Random Tech or Magnaflow High Flow Catalytic Converter to my existing mods on my 1996 LT4 [corsa catback, gm hotcam, tb air foil, 160 ts, LT1 edit custom tuning]. That's right no headers, and no cnc heads. It currently dynos at 331 rwhp and 318 rwtq.

Oct 21, 2004 | 02:56 PM

MYCoupe

Melting Slicks

Joined: May 2003

Posts: 3,490

Likes: 68

From: Hewitt NJ

Quote:

Originally Posted by jcook00

The Xpipe will add more noise and according to what I've read before not that much more power. Considering that the stock cats flow pretty well, I would say 5-10 hp would be the max you could expect from these changes.

Oct 21, 2004 | 03:44 PM

RVY

Pro

Joined: Apr 1999

Posts: 533

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From: Poinciana Florida

The only thing an X pipe did for me was infuriate my neighbors. It lasted maybe one week. If you like the local cops to hear you coming 3 blocks away an X pipe is for you!!! Just my 2 cents.

Oct 21, 2004 | 04:33 PM

jcook00

Thread Starter

Instructor

Joined: Jun 2003

Posts: 101

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From: Austin TX

I guess I am just looking to bolt on about 20 more rwhp for a total of 350 rwhp. I am not sold on long tubes. I tried shorties went back to my stock manifolds. Is there a way to know if I am air flow intake or air flow exhaust restricted by looking at the dyno sheet?

Oct 21, 2004 | 07:41 PM

HC4-Vette

Racer

Joined: Sep 2003

Posts: 260

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From: Indianapolis IN

I have a similar question.

So, will a set of random techs + Xpipe + stock mufflers & exhaust still be too loud?

Oct 21, 2004 | 09:39 PM

MYCoupe

Melting Slicks

Joined: May 2003

Posts: 3,490

Likes: 68

From: Hewitt NJ

Quote:

Originally Posted by jcook00

I don't know of a way to tell from looking at the dyno sheet, but look at it this way. The stock LT4 has the same exhaust components as a LT1 yet it's rated at 30 more horses. The increased horsepower mainly comes from the improvents to the intake side (heads, cam, intake) so it would stand to reason that you should open up the exaust side. I would think that with a pair of LT headers, RT cats and a good flowing exhaust such as the Corsa or B&B you should attain your goal of an additional 20 RWHP.

Quote:

Originally Posted by HC4-Vette

I have a similar question.

So, will a set of random techs + Xpipe + stock mufflers & exhaust still be too loud?

No, it shouldn't be too loud because the stock mufflers are pretty quiet. I put on a set of Magnaflow mufflers on my car (rest of the system is stock) and the noise level increased considerably.

Oct 22, 2004 | 01:40 AM

BAM92

Safety Car

Joined: May 2003

Posts: 4,283

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From: Houston Texas

I went from stock exhaust to Hooker shorties and Corsa. Good seat of the pants improvement. Then went to TPis LT's, Random Techs and Flowmaster catback. BIG difference. LT's is the way to go if you don't have to worry about a visual inspection.