This is a GREAT car. I thought I was going to keep this car for the long haul. so I invested roughly $5000 in upgrades. The car is in excellent condition. My intent was to upgrade the looks. handling. and sound system. There are NO engine mods at all. I have never driven this vehicle aggressively. I have owned it for two years. It has been completely detailed twice. including having the engine steam cleaned above and below. I wash it weekly and it receives 6 waxes per year. It is VERY well maintained. The wheels. tires. and suspension have only 6k miles on them. This car is superbly cared for and well maintained. Lots of upgrades. - Alpine CDE-135BT stereo head unit - CD receiver with AM/FM tunerbuilt-in MOSFET amplifier (18 watts RMS CEA-2006/50 peak x 4 channels)built-in Bluetooth for hands-free calling and audio streamingfull Pandora control for Android and BlackBerry over Bluetoothplays all CDs and MP3 files- (2) Alpine Type R speakers6-3/4" 2-way car speakers (pair)multi-layer hybrid fiber woofer with Santoprene® rubber surround1" swiveling silk dome tweeterpower range: 2-100 watts RMS (300 watts peak power)- (2) Alpine Type S speakers 6-3/4" 2-way speakers (pair)includes adapter rings for 6-1/2" openingsmineral-fortified polypropylene woofer cone with rubber surround1" silk dome tweeterpower range: 2-80 watts RMS (240 watts peak power)- Alpine MRV-500w 5 channel ampmono subwoofer car amplifier300 watts RMS x 1 at 4 ohms (500 watts RMS x 1 at 2 ohms)variable low-pass filter (50-400 Hz. 24 dB/octave)variable bass boost (0-12 dB at 50 Hz)Class D amp with MOSFET power supplypreamp and speaker-level inputspreamp outputs- RUX-KNOB bass knobremote level controller for Alpine mono subwoofer amplifiersadjusts gain from 0 to -12 dB- JL Audio Stealthbox subwooferStealthbox® custom-fit subwoofersealed fiberglass enclosureW6v2 10" 4-ohm DVC subwoofer wired for 2-ohm monosteel-mesh grille includedpower handling: 150-600 watts RMS (1. 00 watts peak power)- Custom sound deadening in the trunk - Materials purchased from Sound Deadener Showdown dot com - Rubber floor mats in front/ back seats and trunk. Reads "CIVIC" on the mats. - HFP (Honda Factory Performance) sport tuned suspension " The HFP suspension is designed to drop the Civic about 1 inch and lower the vehicle's roll center. High performance dampers are tuned for enhanced road handling characteristics and decreased body roll. " Part # 08W60-SNA- Honda Civic SI torsion bars for decreased body roll - HFP (Honda Factory Performance) 18" blade silver wheels- Michelen Pilot A/S 3 All Season Ultra High Performance Sport tires. - Carpeted trunk lid insulator- Honda exposed wheels locks- Honda R18 engine cover upgrade- Trunk cargo net