#34980 - 11/27/05 11:03 PM
Exhaust Q's!
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Registered: 11/25/05
Posts: 108
Loc: Minnesota
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1. Does anyone here have SLP or Dynomax cat-back exhaust, and do you like either of them? Which is better to get? 2. Does the dynomax catback delete the stock resinator? I cant tell from the picture on PFYC.com 3. What Does the stock resinator do, and does it restrict exhaust flow? 4. What kind of horsepower gains can i expect with just a intake and catback exhaust, pcm, & U-Bend Delete? Thanks for your help!
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Short Ram Air Intake | Throttle Body Spacer| Throttle Body Screen Removed | ZZP PCM | 180* Thermostat| Debaged |Flipped Sway Bar | Strut Tower Stabilizer | Motor Mounts | Tr55's | Coming soon : 3" DP |
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#34981 - 11/28/05 12:11 AM
Re: Exhaust Q's!
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Registered: 07/09/05
Posts: 187
Loc: Southington CT
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1. No 2. I believe it does 3. The resonator takes the sound and resonates it through a chamber, making the exhaust note considerably quieter. It does restrict flow, if only slightly. 4. You can expect APROXIMATELY 30hp, depending on other mods. UBend is good for like 10-15, PCM is another 10-15 with no mods, and catback isnt really a hp increase, because the stock one is good to like 300whp.
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'97 GTP Devils Own Progressive Alcohol Injection, TB Spacer, MSD Ignition, TR55s, IPCM, 2.5" Exhaust (no cat) with Borla Muffs, FWI, 2 Pod A-Pillar, 3.4", 160* T-Stat, PowerSlots,
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#34982 - 11/28/05 12:24 AM
Re: Exhaust Q's!
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Registered: 05/01/02
Posts: 2126
Loc: Portland Or.
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Hello,
1. I can't help you with that one. 2. Catback Exhaust does not delete the U-bend. Catback Exhaust is designed to bolt to the flange just after the U-bend. 3. I agree with Evolution, and would like to add that the resonator is primarily designed to reduce cabin noise. Slightly restrictive, but, IIRC you can see through it, so restriction is minimal. 4. I'm guessing 20-30HP
Later now, Clint
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#34983 - 11/28/05 06:03 AM
Re: Exhaust Q's!
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Registered: 02/08/04
Posts: 3463
Loc: Gonzales Tx.
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#34984 - 11/28/05 10:56 AM
Re: Exhaust Q's!
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Registered: 07/15/04
Posts: 3141
Loc: Chicago, IL
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Let us know what happens with you choice.
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DHP V1.0, Slotted rotors, S/S Brake Lines, Custom CAI, GMPP Handling Kit, KYB's, Jimmy C DP (U-Bend delete w/ Hi-flow cat), Flowmaster Super 40's, drilled 180° T-Stat, Alt. Rewire & Alt. Voltage Booster Combo, 605's, ZZP Motor Mounts
"The only difference between me and a madman is that I am NOT mad!" - Dali
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#34985 - 11/28/05 01:06 PM
Re: Exhaust Q's!
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Registered: 11/25/05
Posts: 108
Loc: Minnesota
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Basically what i got from your answers is that stock exhaust is pretty much fine for flow. Do you think cat-back exhaust is mainly for sound, maybe a lil better flow? Thanks for all of your answers
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Short Ram Air Intake | Throttle Body Spacer| Throttle Body Screen Removed | ZZP PCM | 180* Thermostat| Debaged |Flipped Sway Bar | Strut Tower Stabilizer | Motor Mounts | Tr55's | Coming soon : 3" DP |
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#34986 - 11/28/05 01:15 PM
Re: Exhaust Q's!
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Registered: 07/29/04
Posts: 1563
Loc: Ohio
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Here is Trasher's study of exhaust. http://thrashercharged.com/tech_htm/exhaust.shtm In my opinion and based on this study, it does help hp but not by much. Heavy modded cars would benefit more. However, it is primarly for sound.
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[GONE] GenV GTP engine, 12" Brakes, CAI, 3" DP, HighFlo Cat, 180 T-Stat, Aeroforce Gauge, Front STB, Stinger Fiberglass hood, Reflective Graphics.
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#34987 - 11/28/05 02:30 PM
Re: Exhaust Q's!
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Registered: 07/15/04
Posts: 3141
Loc: Chicago, IL
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Originally posted by TastyBake: However, it is primarly for sound.
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DHP V1.0, Slotted rotors, S/S Brake Lines, Custom CAI, GMPP Handling Kit, KYB's, Jimmy C DP (U-Bend delete w/ Hi-flow cat), Flowmaster Super 40's, drilled 180° T-Stat, Alt. Rewire & Alt. Voltage Booster Combo, 605's, ZZP Motor Mounts
"The only difference between me and a madman is that I am NOT mad!" - Dali
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#34988 - 11/28/05 08:27 PM
Re: Exhaust Q's!
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Member
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Registered: 11/25/05
Posts: 108
Loc: Minnesota
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thanks tasty bake that link was interesting. so a cat-back will typically gain about 5-7hp, and up to 10hp at the most. I read somewhere on hear that replacing the U-Bend will add another 10hp is that true??? if it is, that would mean that u-bend adds 10hg of backpressure???
_________________________
Short Ram Air Intake | Throttle Body Spacer| Throttle Body Screen Removed | ZZP PCM | 180* Thermostat| Debaged |Flipped Sway Bar | Strut Tower Stabilizer | Motor Mounts | Tr55's | Coming soon : 3" DP |
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#34990 - 11/28/05 10:53 PM
Re: Exhaust Q's!
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Member
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Registered: 11/25/05
Posts: 108
Loc: Minnesota
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So should i just keep the stock exhaust and upgrade mufflers, and u-bend delete?
_________________________
Short Ram Air Intake | Throttle Body Spacer| Throttle Body Screen Removed | ZZP PCM | 180* Thermostat| Debaged |Flipped Sway Bar | Strut Tower Stabilizer | Motor Mounts | Tr55's | Coming soon : 3" DP |
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#34992 - 11/29/05 09:46 AM
Re: Exhaust Q's!
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Member
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Registered: 07/15/04
Posts: 3141
Loc: Chicago, IL
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Agree with Herc. Think about what extent your mod plans are for the GP.
Definately, get the U-Bend delete. It will give you around 4-8 hp gain. If you're thinking about getting muffs, you also think about getting 2.5" pipes. Going further, you can think about getting a 3" downpipe with/out a hi-flow cat.
Post up if you have further questions.
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DHP V1.0, Slotted rotors, S/S Brake Lines, Custom CAI, GMPP Handling Kit, KYB's, Jimmy C DP (U-Bend delete w/ Hi-flow cat), Flowmaster Super 40's, drilled 180° T-Stat, Alt. Rewire & Alt. Voltage Booster Combo, 605's, ZZP Motor Mounts
"The only difference between me and a madman is that I am NOT mad!" - Dali
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#34993 - 12/01/05 01:03 PM
Re: Exhaust Q's!
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Member
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Registered: 09/16/05
Posts: 33
Loc: Massachusetts
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I deleted my cat, u-bend and res. with one 2 1/2" straight pipe with a 02 sensor bung for after the cat. I lost approx 2MPG and gained approx 10-15 hp to the wheels. This was when the car was completely stock.
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2001 GT w/ 67K, Midnight blue, Gold-line 2" Lowering Springs, SLP loud mouth cat back, Cat delete with O2 Sim, 17 x 9.5 Chrome Cobra r's with 245/40/17 up front 275/40/17 on the back.
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