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PostPosted: Sat May 04, 2019 11:40 pm 
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Joined: Mon Apr 29, 2019 12:01 am
Posts: 5
Location: Wyoming
Year and Trim: 1999 Bonneville SLE
I am looking into some performance parts for my Bonnie. Was wondering if there are any lowering kits, body kits, headlight kits, and such to change the look some. Can you please share what and where, also it's anything interchangeable with same year grand Prix?


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PostPosted: Sun May 05, 2019 8:33 am 
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Joined: Mon May 10, 2010 6:11 pm
Posts: 9118
Location: Chicago, IL
Year and Trim: 2003 SLE
Unfortunately, just about everything will have to be custom made for these cars. Nothing interchanges with Grand Prix as far as visual stuff.

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"Penelope" - 2003 SLE - 193k Miles
"Sydney" - 2000 Honda S2000 - 67k miles
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PostPosted: Sun May 05, 2019 11:15 pm 
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Joined: Wed May 21, 2008 11:47 pm
Posts: 6068
Location: Philly
Year and Trim: 95 SLE
Performance - Without a blower it'll take a cam and bolt ons to get over 200whp naturally aspirated. Search top swap and L67 swap. ZZP and Intense are the major vendors. Turbo setups will require a built trans.

Appearance - Nothing off the shelf is available.

Suspension - Click the link in my signature. 92-99 is all the same.

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95 SLE... a keeper. 241k miles. Low and Slow.
97 BMW 528i
98 Infiniti vq35'd i30: 13.3@104mph, 30MPG Hwy
02 Jag X-type
03 BMW M5
07 Infiniti G35s 6MT
07 Ducati Monster S2R 800 with DS1000 swap
05 Suzuki DRZ400S
83 Yamaha IT175K
72 Yamaha DS7: '74 RD250 swap, JL chambers

Info on dropping a 92-99: Here.


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PostPosted: Mon May 06, 2019 8:43 pm 
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Joined: Sat Oct 28, 2017 10:00 pm
Posts: 85
Year and Trim: 2003 Pontiac Bonneville SSEI
If You're serious about the performance side, you would want a built 4T65E-HD trans not the 4T60. you can extend the life of your trans by installing a shift kit and and aftermarket cooler that cools the trans fluid down after it goes through the radiator...or you could bypass the radiator's trans cooler completely, but that has other implications/issues in cold weather climate areas. You will also need or need access to tuning software such as HP Tuners, it will pay dividends in the long run vs paying repeatedly to have your pcm re-flashed by a vendor every time you decide to change up your setup with new parts, bigger injectors, added intercooler, different cam etc.

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2003 Pontiac Bonneville SSEI
3.8L V6 SC, 180*T (Drilled),
GXP Tails, Interior Door handles, Trim pieces etc.
40th Aniv Grand Prix GTP Wheels (Very Shiny & Very Annoying :pukeleft: )
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PostPosted: Mon May 06, 2019 10:50 pm 
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Joined: Wed May 21, 2008 11:47 pm
Posts: 6068
Location: Philly
Year and Trim: 95 SLE
99s have the 4t65-e, which have been in the 12s on the stock, non-HD, diff with blower cars.

IIRC 97 was the last year for the 4t60-e behind the L36 and 96 was the last year for a 4t60-hd behind a L67.

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95 SLE... a keeper. 241k miles. Low and Slow.
97 BMW 528i
98 Infiniti vq35'd i30: 13.3@104mph, 30MPG Hwy
02 Jag X-type
03 BMW M5
07 Infiniti G35s 6MT
07 Ducati Monster S2R 800 with DS1000 swap
05 Suzuki DRZ400S
83 Yamaha IT175K
72 Yamaha DS7: '74 RD250 swap, JL chambers

Info on dropping a 92-99: Here.


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