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Old 11-14-2014, 08:23 AM   #1
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Is straight piping (with a muffler) bad for the car?

I've been wanting to remove all the cats and resevoirs from my exhaust for a while now. Basically straight pipe to a muffler. But I was informed yesterday that that would eliminate the back pressure and eventually f up my motor.
Now this may not have anything to do with it, but I have Toms tune. Could he reflash some stuff to make it alright?


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Old 11-14-2014, 03:30 PM   #2
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lost me somewhere around resevoirs

Removing a CAT can be done, and Tom can tune for any differences.

You'll have to decide how you'll be handling the MIL for no CAT.
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Old 11-14-2014, 04:12 PM   #3
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Tom can rewrite your tune to remove the rear o2 sensor. A lot of people have removed their catalytic converters and used an Off Road Pipe instead. Also, a lot of aftermarket exhaust systems only have a muffler before the axle. All aftermarket exhausts I have seen have removed the rear resonator. But some also have a mid-mounted resonator in the exhaust tunnel before the muffler.
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Old 11-14-2014, 04:58 PM   #4
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Where do people get this back psi hurts engines or removing it hurts car engines

Yes I can make the needed changes , the loudness you will be tired of in the first day tho

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Old 11-14-2014, 06:12 PM   #5
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I ran ORP with no resonator with 2.5 piping back to a summit turbo muffler it was like 20 bucks and go alot of compliments now im back to stock and I love the factory SVT sound
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Old 11-15-2014, 07:05 AM   #6
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I'm not sure Tom haha thats just what people were warning me about and I have no idea what they're talking about
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Old 11-15-2014, 07:35 AM   #7
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Quote:
Originally Posted by 1turbofocus View Post
Where do people get this back psi hurts engines or removing it hurts car engines
It's people who don't know what they're talking about parroting what they read somewhere on the internet combined with a game of telephone where the story gets changed a little bit each time it's retold. Eventually it exists in this form, where people believe you need backpressure on the pistons to dampen the stresses the rods feel as the piston changes direction or some other bs like that.

Google "open header dyno gain", there are plenty of results showing gains in both directions, both with and without a proper exhaust system.

It is possible to properly design an exhaust system (primary diameter, primary length, secondary diameter and length, catback diameter, muffler selection, etc.) that maximizes performance through proper scavenging and minimizes power loss from flow restriction.

Running an open header or straight pipe won't ruin your engine, but it will ruin your hearing and the peace and quiet for everyone you drive past. Don't be an . Gaining 4hp at 6000rpm isn't worth being that dick in the slow car with the loud exhaust constantly blatting around the neighborhood.
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Old 11-15-2014, 07:47 AM   #8
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Quote:
Originally Posted by Laminar View Post
. Don't be an . Gaining 4hp at 6000rpm isn't worth being that dick in the slow car with the loud exhaust constantly blatting around the neighborhood.

Well said.. Hahah love the automatic cavaliers with the cherry bomb hanging off the back..
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Old 11-15-2014, 02:37 PM   #9
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i was younger when I had mine...I got over it after about 2 years and I feel in love with the factory SVT sound...if you remove just the rear res it gives it crispier grawl
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Old 11-30-2014, 01:32 AM   #10
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'Where do people get this back psi hurts engines or removing it hurts car engines'

I think it comes from the old (REAL OLD) school Harley or biker guys back when engines often were run with virtually no pipe on them at all, maybe only a short length. Cold air ingestion with that short pipe leads to valve burning or even breaking off. The dirt racers ran into that too back when engine tech was still stone age. 12 inch long pipe don't cut it there.

I personally feel as Tom, having dragraced for many years. If you have a good exhaust then running it wide open will get you all the power the engine can make, back pressure is for the losers. Anybody thinking it helps is WAAAAAAAAAY behind the times.
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